Although plenty in life is unpredictable, one thing is guaranteed: we all get older. And yes—aging brings physical and mental changes that can affect how your body feels and performs, both in everyday life and when you’re pushing the pace in training.
But here’s the good news: getting older doesn’t mean you stop improving as a runner; it just means you train smarter.
While it’s true that age can influence running performance, the “why” and the “how much” are often misunderstood, and the decline isn’t nearly as straightforward (or dramatic) as most people assume.
With smart training, strength work, and the right recovery habits, many runners stay impressively fast for decades.
In this guide, we’ll break down what really happens to your body as you age, which factors matter most for speed and endurance, and what you can do to keep running strong as the years go by.
Do Runners Slow Down As They Age?
A large survey of 194,560 participants in a 15km road race, tracked from 1995 to 2007, found that running performance declined after the age of 40, with a 0.20% increase in finish time per year, accelerating after the age of 65.1Celie, F., Faes, M., Hopman, M., Stalenhoef, A. F. H., & Rikkert, M. G. M. O. (2010). Running on age in a 15-km road run: minor influence of age on performance. European Review of Aging and Physical Activity, 7(1), 43–47. https://doi.org/10.1007/s11556-010-0059-4
Interestingly, the age-associated decline in running performance was 5.9% greater in men than in women and 4.5% greater in trained runners than in untrained runners.
Another study that looked at race results of 200 age-group leaders in the 5k, 10k, half marathon, and marathon found that there was no decrease in running performance before the age of 35.2Fair, R. C., & Kaplan, E. H. (2017). Estimating Aging Effects in Running Events. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.3022196
Over the five-year period from ages 35 to 40, running speed and performance decreased by only 1% on average. Then, between the ages of 40 and 70, running performance seems to decline at about 1% per year.
Between the ages of 70 and 90, running times seem to decline by about 1.5% per year and then nearly 2 to 3% per year between the ages of 90 and 95.
Although this sounds like a lot, the researcher noted that even by age 90, runners are just a little more than twice as slow as their peak performance in their prime running years.
Why Does Running Performance Decline With Age?
Scientific evidence, as well as thousands of race results, demonstrate that running speed and performance decline with age.
But why do runners slow down as they age? What physiological mechanisms underlie running performance decrements that accompany aging?
According to the American College of Sports Medicine, several key physiological functions that normally support endurance aerobic exercise, such as running, decline with age.3American College of Sports Medicine Position Stand. Exercise and physical activity for older adults. (1998). Medicine and Science in Sports and Exercise, 30(6), 992–1008. https://pubmed.ncbi.nlm.nih.gov/9624662/
These functions include:
- A decrease in maximum heart rate
- A decrease in the elasticity and dilation capabilities of blood vessels
- A decrease in the strength of cardiac muscle fibers
- A loss of muscular strength, particularly in fast-twitch muscle fibers
- A decrease in bone density
- An increase in body fat percentage
- A decrease in aerobic capacity and cardiovascular fitness
- Poorer lactate clearance
Ultimately, the decline in running performance that accompanies aging is mainly attributable to a decrease in aerobic capacity (VO2 max) and muscle mass (sarcopenia).4Goodpaster, B. H., Park, S. W., Harris, T. B., Kritchevsky, S. B., Nevitt, M., Schwartz, A. V., Simonsick, E. M., Tylavsky, F. A., Visser, M., & Newman, A. B. (2006). The Loss of Skeletal Muscle Strength, Mass, and Quality in Older Adults: The Health, Aging and Body Composition Study. The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, 61(10), 1059–1064. https://doi.org/10.1093/gerona/61.10.1059
Studies suggest that endurance capacity decreases by about 10% per decade after age 30 due to age-related declines in VO2 max. VO2 max ultimately encapsulates how well you are able to take in, deliver, and utilize oxygen in your body during physical activity.5Siparsky, P. N., Kirkendall, D. T., & Garrett, W. E. (2013). Muscle Changes in Aging. Sports Health: A Multidisciplinary Approach, 6(1), 36–40. https://doi.org/10.1177/1941738113502296
Researchers point to a decrease in mitochondria, the organelles inside your muscle fibers that produce energy during aerobic exercise, as well as sarcopenia (loss of muscle mass), as the primary culprits for worsening VO2 max with age.6Ibebunjo, C., Chick, J. M., Kendall, T., Eash, J. K., Li, C., Zhang, Y., Vickers, C., Wu, Z., Clarke, B. A., Shi, J., Cruz, J., Fournier, B., Brachat, S., Gutzwiller, S., Ma, Q., Markovits, J., Broome, M., Steinkrauss, M., Skuba, E., & Galarneau, J.-R. . (2012). Genomic and Proteomic Profiling Reveals Reduced Mitochondrial Function and Disruption of the Neuromuscular Junction Driving Rat Sarcopenia. Molecular and Cellular Biology, 33(2), 194–212. https://doi.org/10.1128/mcb.01036-12
According to research, in absolute terms, the age-related declines in VO2max appear to be approximately 0.40, 0.39, and 0.46 ml/kg/min per year for sedentary, active, and highly-trained males, respectively, and 0.35, 0.44, 0.62 ml/kg/min per year for sedentary, active, and highly-trained female, respectively.7Kim, C.-H., Wheatley, C. M., Behnia, M., & Johnson, B. D. (2016). The Effect of Aging on Relationships between Lean Body Mass and VO2max in Rowers. PLOS ONE, 11(8), e0160275. https://doi.org/10.1371/journal.pone.0160275
Although the absolute decreases in VO2 max are higher for trained subjects, because their VO2 max is much higher, the relative decrease is less.
Other research suggests that the decline in VO2 accelerates from 3% to 6% per 10 years from the 20s and 30s to the 70s, 20% every 10 years past the age of 70, with a larger decrease seen in men.8Betik, A. C., & Hepple, R. T. (2008). Determinants of VO2 max decline with aging: an integrated perspective. Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition et Metabolisme, 33(1), 130–140. https://doi.org/10.1139/H07-174
Additionally, maximum heart rate decreased by 4-6% with each decade after the age of 20, but rates of reduction accelerated only minimally with advanced age.
In the book Lore of Running, author and exercise physiologist Dr. Tim Noakes, MD, reports in addition to a decline in aerobic capacity, sprint speed and power production also decrease with age.
This is primarily due to the loss of lean muscle mass, most pronounced in fast-twitch muscle fibers (which are responsible for fast, explosive, and powerful contractions).
According to Dr. Noakes, older adults who continue to perform high-intensity interval workouts and strength training are usually able to preserve this muscle mass until the age of 50 or so.
However, between the ages of 50 and 70, there is typically a loss of about 15% of lean muscle mass (sarcopenia) per decade. This rate of sarcopenia increases further after the age of 70.9Dao, T., Green, A. E., Kim, Y. A., Bae, S.-J., Ha, K.-T., Gariani, K., Lee, M., Menzies, K. J., & Ryu, D. (2020). Sarcopenia and Muscle Aging: A Brief Overview. Endocrinology and Metabolism, 35(4), 716–732. https://doi.org/10.3803/enm.2020.405
In addition to losing actual muscle mass, another contributing factor to the loss of strength and running speed is the degradation of the nervous system’s control of the remaining muscle fibers.
Muscle fibers contract via motor units, which can deteriorate or reorganize as we age.
As they do so, they become less efficient, meaning they cannot contract as rapidly or forcefully. Sprinting, or running fast, requires powerful, explosive, and rapid muscle contractions. Therefore, running speed declines with age as motor unit function deteriorates.
Finally, biomechanical forces may also be at play. Our running gait can also change as we age.
One study found that one of the primary reasons running speed seems to decline with age is a decrease in stride length, not stride rate (cadence).10DEVITA, P., FELLIN, R. E., SEAY, J. F., IP, E., STAVRO, N., & MESSIER, S. P. (2016). The Relationships between Age and Running Biomechanics. Medicine & Science in Sports & Exercise, 48(1), 98–106. https://doi.org/10.1249/mss.0000000000000744
Additionally, peak power, ankle and calf muscle activation, and ground reaction forces were lower in older athletes. This means that older runners do not push off the ground as forcefully, which decreases forward propulsion and running speed.
In fact, with each additional decade of life, runners in the study showed a decrease of about 20% in stride length and running speed.
Our Top Tips to Reduce Age-Related Performance Decline In Running
If it were possible to completely prevent the effects of aging on running performance, you could package the strategy and make millions of dollars.
With that said, there are specific actions you can take to reduce the effect of aging on your running speed and performance:
#1: Incorporate Strength Into Your Training Plan
Strength training or weight training/weight lifting 2-3 times per week with total-body workouts can help attenuate the losses in muscle mass and strength and can keep your tendons healthier.11Nedergaard, A., Henriksen, K., Karsdal, M. A., & Christiansen, C. (2013). Menopause, estrogens and frailty. Gynecological Endocrinology, 29(5), 418–423. https://doi.org/10.3109/09513590.2012.754879 12Giallauria, F., Cittadini, A., Smart, N. A., & Vigorito, C. (2016). Resistance training and sarcopenia. Monaldi Archives for Chest Disease, 84(1-2). https://doi.org/10.4081/monaldi.2015.738
Strength training is one of the most effective tools aging runners have to fight sarcopenia.13Nedergaard, A., Henriksen, K., Karsdal, M. A., & Christiansen, C. (2013). Menopause, estrogens and frailty. Gynecological Endocrinology, 29(5), 418–423. https://doi.org/10.3109/09513590.2012.754879 14Giallauria, F., Cittadini, A., Smart, N. A., & Vigorito, C. (2016). Resistance training and sarcopenia. Monaldi Archives for Chest Disease, 84(1-2). https://doi.org/10.4081/monaldi.2015.738 Lifting weights doesn’t just help you stay faster; it also supports running economy, balance, and injury resistance by keeping muscles strong and tendons healthier.
Aim for 2–3 total-body strength sessions per week, focusing on compound lifts and key running-support patterns: squats or split squats, hip hinges/deadlifts, step-ups or lunges, calf raises, a push, a pull, and core stability.
Use moderately heavy loads you can control with good form, and progress gradually over time, because maintaining muscle and durability comes from consistent, progressive strength work.
#2: Run Hills
Hill sprints essentially function as speed and strength training rolled into one, so they can work double-duty to preserve fast-twitch muscle fibers and maximal running speed. They are also less stressful on the body compared to track workouts.
Focus on short, explosive hill sprints lasting no more than 30 seconds. Attack each repeat as fast as possible, taking full recovery time on the way down. Adding hill workouts to your training plan once a week can be a highly effective way to stay fast and sharp as an aging runner.
#3: Add Running Form Drills To Your Warm Up
Running form drills become even more valuable as we get older.
Movements like A-skips, high knees, butt kicks, and cariocas help reinforce efficient mechanics, improve coordination, and keep your neuromuscular system sharp.
For older runners, drills act as a bridge between easy running and faster work, waking up muscles and reminding your body how to move well without the impact or fatigue of hard intervals.
While it’s true that average running speed tends to decline with age, that decline isn’t inevitable or irreversible. Regularly incorporating short, 5–10-minute drill sessions, one to two times per week, can help preserve stride length, cadence, and reactive strength.
Over time, these small investments pay off by improving running economy, reducing injury risk, and helping runners stay smooth, efficient, and surprisingly quick well into later decades.
#4: Don’t Neglect Your Diet
To decrease muscle loss and prevent excessive fat gain, make sure you follow a nutritious diet. This means getting enough protein and reducing your caloric intake as your BMR decreases.
The American College of Sports Medicine recommends that athletes consume at least 1.2–2.0 grams of protein per kilogram of body weight per day.15ACSM Certification Blog and Articles. (n.d.). ACSM_CMS. https://www.acsm.org/all-blog-posts/certification-blog/acsm-certified-blog/2021/01/25/nutrient-ratios-for-strength-training
#5: Prioritize Recovery and Rest
As we age, it’s often not training that limits performance, but recovery. Older runners can still handle hard workouts, but they typically need more time to absorb them.
Build your week so that hard sessions are followed by true easy days or rest days.
Protect your sleep, fuel adequately, and don’t hesitate to swap a planned hard workout for an easy run if your body feels fatigued. Consistent training over months and years, not forcing workouts on tired legs, is what allows aging runners to stay fast and healthy.
#6: Adjust Your Training Volume
With age, it’s often smart to be more selective about mileage rather than simply trying to maintain the highest volume you’ve ever run. Many runners benefit from slightly lower weekly mileage paired with higher-quality sessions.
This might mean fewer “garbage miles,” shorter long runs, or an extra rest day each week.
The goal isn’t to do less, but to do what matters most. By managing volume carefully, you reduce injury risk, improve recovery, and leave more energy for the workouts that actually maintain speed and performance.
#7: Maintain Mobility And Range Of Motion
Loss of mobility, especially in the hips, ankles, and upper back, can affect running form over time. Tight or restricted joints affect stride length, posture, and efficiency, increasing stress on muscles and tendons.
Incorporate short, regular mobility work focused on dynamic movements rather than long static stretches.
Even 5–10 minutes a day can help maintain range of motion, support good running mechanics, and keep your stride feeling smooth and fluid.
Think of mobility work as routine maintenance. It keeps everything moving the way it should.
#8: Stay Positive
Aging can absolutely bring physical changes, and sometimes a mental hit, too, especially if you’re used to measuring yourself by pace.
But here’s the truth: staying positive doesn’t mean pretending nothing is different. It means focusing on what you can control: your consistency, your effort, your habits, and your love for the sport.
Even if your times shift, running can keep getting better. You gain something incredibly valuable with experience: smarter pacing, better self-awareness, stronger mental resilience, and a deeper ability to enjoy the process.
Running becomes less about proving something and more about building a running life you’re proud of. One where you still move, explore, compete (if you want), and feel strong in your body for decades.
So stay committed to the long game. Train with purpose, celebrate your wins (big and small), and remember: being a lifelong runner isn’t just about speed. It’s about showing up, staying healthy, and keeping that spark alive year after year.
Where Do I Start?
Strength training is one of the best preventative strategies you can take to stay fit, strong, and healthy as you get older.
To start up your strength training routine today, take a look at our training guide geared specifically toward people over 55:
Hi
Interesting reading – about a subject I personally experience
As an 74 aged male who can run a sub 4 hour marathon, my experience is that up to age 70 the degeneration is relatively slow, sadly after 70 decline experneciates
BUT with effort we can sort of keep up
Be positive, and constant ~ Run regularly but rest and recover more
Include full body strength training, hill workouts & sprints
and smile at the youngsters who will also age!!