By age 50, 5 out of 10 men have an enlarged prostate (BPH). By age 80, up to 9 out of 10 men have an
enlarged prostate. Having an enlarged prostate does
not always cause symptoms. But BPH symptoms also are age-related. By age 75, 5
out of 10 men complain of a decrease in the force of their urine
Lower urinary tract problems in
men under age 40 are most likely caused by other conditions, such as prostate
infection or failure of the smooth bladder muscles to relax during urination
Presti JC, et al. (2008). Benign prostatic hyperplasia
(BPH) section of Neoplasms of the prostate gland. In EA Tanagho, JW McAninch,
eds., Smith’s General Urology, 17th ed., pp. 348–370.
New York: McGraw-Hill.