Benign (noncancerous) enlargement of the prostate, known as benign prostatic hyperplasia (BPH for short), is the most common prostate problem in men. Almost all men will develop some enlargement of the prostate as they age. Overall, the number of men with BPH increases progressively with age. By age 60, 50% of men will have some signs of BPH. By age 85, 90% of men will have signs of the condition. About one third of these men will develop symptoms that require treatment.