Thanks for your feedback. Use them or lose them. So for <40 age we can do what you advised squats and stretching. But what about >40? please suggest.
Also I want to add https://superuser.com/a/914862 the first comment of the accepted answer tells other side of the story(out of memory stuff). This is just for the analogy. What do you suggest for that?
40, 50, 70... If you can move, try expanding your range of motion. If you can do the range of motion, start adding weight. I don't think there is something magic that stops one from starting to be healthier at 40. I'm also a layman.
Also I want to add https://superuser.com/a/914862 the first comment of the accepted answer tells other side of the story(out of memory stuff). This is just for the analogy. What do you suggest for that?