Yes, staying active is important, but our bodies break down no matter what. Some people suffer from arthritis and other ailments and make being active more difficult. I always question those studies that say active people are healthier and live longer, because maybe people are more active because they fell better and are not as ill or incapacitated as those who are less active. In other words, correlation does not prove causation.
Well, over the long term it does.
If you do nothing between the age of 40 and 65, you’re not going to live long...or comfortably.
Being physically active will stave off severe deterioration. If you start early enough. And stick with it.
But if you’re already having trouble getting out of your chair, you’re on the down slope. Recovery being quite difficult.