BPH (benign prostatic hyperplasia) is a natural consequence of aging and is more likely to occur in men whose fathers or brothers experienced prostate enlargement. However, BPH occurs in nearly all men over time, as long as they have testes. About 50% of men who are 50 have evidence of microscopic enlargement of the prostate gland, and at least 30% of men require treatment by the time they reach 70 years of age.