I can tell you that I was someone who didn't start Masturbating until fairly later on in life (I would say a few years after I left Puberty) but honestly I don't feel much weaker now than I did in my Pre-Masturbation day, the only difference I see is that I almost never have wet dreams anymore.

There have also been times when I have gone to certain places and didn't Masturbate for the duration of the time I was there however when I left I also didn't feel like I had much strength.