Excercise and fitness in old age?

Question

I have seen so many news and study online, saying exercise keeps body healthy in old age and keeps us fit? how is this possible normal tear and wear will become more with activity hence more mutation hence more loss. Why exercise help?Tear and wear means lots of regeneration in our body, regeneration will lead to mutations, no regeneration is perfect, hence more regeneration's, more risk of bad DNA.

Answer 1

To clear things up, no matter how much you exercise, the DNA within your cells will not be affected.

Secondly, the "tear and wear" muscles experience in exercise are the reason muscles develop. As you engage the muscles, both muscles and, to a lesser extent, bones are broken down on the molecular level to be re-built stronger. This is how muscles develop.

Exercising in your age is recommended because, for the most part, it keeps the muscles active and growing. I have known of several people in their 80's who continue to lift weights. I say "for the most part" because a person's genetics could hinder this, either by cancer, osteoporosis, or another genetic-related disease.