Its a very sad day when you realise that your body will no longer do want you want it to !, and its very difficult to give up something you love doing.
There are far too many elderly Morris dancers whose athleticism and sprightliness has long departed still hobbling around rheumatically, doing themselves further injuries, and performing what has become a pastiche of their craft. also musicians particularly amongst the jazz fraternity whose "lip" has gone along with their stamina and concentration, not to mention singers whose once powerful voices have degenerated into a feeble croak.
as I said its difficult to give up what you love doing, but eventually we have to stop, and live with our memories and dine out on anecdotes of our youthful prowess !!.