In Biblical times before medical knowledge and the science of biology had much in advancement it was thought that we were born with whatever "seed" or sperm we had and that this given quantity had to last us our lifetime.
As medical science advanced it was discovered (by most) that sperm and seminal fluid are produced and in a strange way sort of recycled. Ultra Conservative individuals to this day base all of their sexual morals on information that is badly outdated.
Unless disease or injury takes place your reproductive organs will go on producing until your age becomes the problem with falling hormone levels.
In fact, people who wank off constantly have a lower percentage of prostate problems as they age, their equipment tends to work far better, and they are less likely to need ED medications as they get older.