BPH, or benign prostatic hyperplasia, is a condition of the prostate that many men develop with age. When men get older, the prostate gland often becomes enlarged. An enlarged prostate can put pressure on the urethra which makes it difficult to urinate. 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.