Yes, there is survivor bias, but the results are very encouraging:
Regular Exercise May Keep Your Body 30 Years ‘Younger’
The muscles of older men and women who have exercised for decades are indistinguishable in many ways from those of healthy 25-year-olds.
Together, these findings about muscular and cardiovascular health in active older people suggest that what we now consider to be normal physical deterioration with aging “may not be normal or inevitable,” Dr. Trappe says.
https://www.nytimes.com/2018/11/21/...cise-may-keep-your-body-30-years-younger.html
Regular Exercise May Keep Your Body 30 Years ‘Younger’
The muscles of older men and women who have exercised for decades are indistinguishable in many ways from those of healthy 25-year-olds.
Together, these findings about muscular and cardiovascular health in active older people suggest that what we now consider to be normal physical deterioration with aging “may not be normal or inevitable,” Dr. Trappe says.
https://www.nytimes.com/2018/11/21/...cise-may-keep-your-body-30-years-younger.html