The site is slow so I can't see it. I'm 68, eat well, lost 20 pounds, work out twice a week. Everything is working fine. But I live in a place surrounded by people in walkers, wheelchairs, or using canes. Some of them have had strokes or accidents making improvement hard, but many simply chose to not do anything to avoid the aging. You don't ordinarily wind up with a walker at a single point; it often starts many years or even decades earlier when you failed to keep in decent physical shape. I almost started too late (last couple of years), I can see how easy it is to not notice your physical being slowly going down. But assuming no major injury or disease, you can improve your body at almost any age, a little at a time, and avoid or at least postpone physical aging for quite a while.

I also write code daily, read the same things I read when I worked, thus keep my brain going too. You can't ignore body or mind, you have to keep both in tune.

I am still getting older, but I am in better shape than I was before I retired. The last time I felt as fit was when I was still playing basketball 30+ years ago.

Don't wait, it's easier to do a little for decades than wait until it's almost too late.