Eventually, the bladder may weaken and lose the ability to empty completely, leaving some urine in the bladder. Benign prostatic hyperplasia often occurs with the second growth phase.Īs the prostate enlarges, the gland presses against and pinches the urethra. The second phase of growth begins around age 25 and continues during most of a man’s life. The first occurs early in puberty, when the prostate doubles in size. The prostate goes through two main growth periods as a man ages. Benign prostatic hyperplasia is also called benign prostatic hypertrophy or benign prostatic obstruction.