You can play basketball until you cannot stand. (Half-court game)
I'm saying this because there is this 57 year old guy who sometimes come and play half-court with us. Obviously, being that old he lacks alot of things but he has two things, a deadly accurate shot and a very quick release. Many times, he is a factor and people actually need to guard him.
Keep in mind, we are guys who play regular basketball, at least once a week or more for years. During my younger days, I played every day for hours. This is the truth, if you have a deadly shot you can play till 60 or until you cannot stand or move.