Prime Potence It is a well-known fact that there are many hormones in the body, which regulate various kinds of vital functions. In the male body, the sexual aspects are controlled by a hormone known as testosterone. However, with age the levels of testosterone start dropping in the male body. And the rate of depletion us quite alarming. The fall in testosterone level can be experienced from as early as 30 years of age and then keeps on going downhill.