Old age and age are different things.

 As lots of peoples are sure,that in old ages are getting lots of diseases, and its a normal after 60 y.old as cannot rise a leg and enter in transport, as a normal feeling insomnia, and wake up as tired,like you are worked a loader.

And if you could not saw a person face, just look back , can you say his age? And we are usually see his steps and body position, as energy walking, activity shakes hands,thus he is a young, but if spin is bended and steps are slow, thus this is adult person. And if its a true, lets s check it.

Does its a here age is fault?

Yes, muscles with a later time are clogs,as in long work, muscles in filling a not relaxed tissues, these tissues are clogged, they are not self relaxing, and if you are rest, lie, and they are loaded, as you are sleep and they are loaded.

And these are two methods for relax tissues as one using in sport is force, kneading sporty massage, and second it in balet as static long for 2 min stretching .As cloged tissues limiting size a move for all muscle, rising load on a not cloged tissues as lowering coefficient useful effect of muscle. As are fillings later giving for adult a full rise hand or leg,they are causing muscle ache syndrome, and osteochondrosis display, arthrosis, feeding for joints top destroying.

And for an own work a every day loading are cloged muscles need in energy ad more muscles in such person as a more harder moving and less energy,that lead to weak often.As for a keeping a loading for muscles a need energy, thus we are not enough in energy.