The most encouraging finding from Karolinska Institutet's 47-year study was not when performance began declining — it was what happened when sedentary adults finally started moving.

According to Karolinska Institutet, participants who became physically active during adulthood improved their physical capacity by approximately 5 to 10 percent. Lead researcher Maria Westerståhl, PhD, put it directly: "It is never too late to start moving."

The study, published in the Journal of Cachexia, Sarcopenia and Muscle, followed 427 people born in 1958 from adolescence through age 63, finding aerobic capacity and muscular endurance generally peaked between ages 26 and 36, with overall capacity down 30 to 48 percent from peak by 63.

But researchers stress exercise slows deterioration without eliminating aging's effects — meaning training still produces meaningful gains from your current baseline, even if the peak has passed.

According to t2ONLINE, a 2024 meta-analysis by Kelley, Kelley and Stauffer covering 22 randomised controlled trials of 552 adults aged 60 and over found resistance training improved VO2 max by about 1.8 mL/kg/min — roughly a 7.8 percent gain from baseline — showing lifting weights benefits cardiovascular fitness, not just muscle.

A separate meta-analysis of 739 older adults, t2ONLINE reports, found resistance training improved overall cognitive function, working memory and both verbal and spatial memory.

Per t2ONLINE, WHO estimates about 684,000 people die from falls each year, with falls causing up to 40 percent of injury-related deaths among older adults and one in three people over 65 falling annually — making strength, balance and gait training a matter of survival, not vanity.

The same column recommends bone-loading free-weight moves like squats, lunges and step-ups, plus single-leg deadlifts for proprioception, noting even people over 80 can build muscle and that the Melbourne Collaborative Cohort Study linked intense exercise to prevented osteoporosis in adults aged 50 to 79.

The practical playbook from both sources is consistent: maintain regular exercise including progressive resistance training, and track improvements in strength and functional performance rather than comparing yourself to a decades-ago peak. t2ONLINE's strength coach Ranadeep Moitra advises committing to just three to four sessions a week with variety, while the Karolinska team's takeaway stands: you cannot stop biological aging, but starting later is considerably better than remaining inactive.