Exercise is great, very important.
However, one of the problems with aging is that some people think they are eating well, but they are not really doing so. They just don't know.
Another issue is the toxic environment we live in.
The 3rd is that often our state of mind or spirit can work against us.
The 4th is our general lifestyle; not getting enough sleep, eating late, not getting enough sun, not being grounded to earth, etc.
Anther issue our mothers tissue quality when she was carrying us, and also our descendants tissue quality, or to put it another way, the rate of which they toxicfied their bodies.
Last, by taking certain supplements that reduce inflammation, and break harmful protein keys, and also taking a good quality probiotics, and doing a colonics routine, (and maybe hyperbaric chamber and/or Ozone therapy too) you have dramatically increased your chances of living a longer life at a higher level of living.
Unfortunately, most people either do not believe this, or have not the discipline and/.or finances to do some or a lot of it.
The saddest thing to me is that many Christians who actually understand the comments the bible makes regarding longevity and food and basic lifestyle still do not have a clue.
But it's all there. The bible is the best practical book in the world for functional use about this subject, if you know where and how to look.