Benign prostatic hyperplasia (BPH) is a condition that occurs in men usually over 50 years old and is characterized by an enlarged prostate. As men age, it is natural for the prostate to become enlarge. BPH is a noncancerous growth of the cells within the prostate gland. By age 60, more than half of men have BPH. By age 85, about 90 percent of men have BPH, but only about 30 percent will have symptoms.