As men get older, their prostate starts to grow. Prostate enlargement (also known as Benign Prostatic Hyperplasia or BPH), usually begins after the age of 40. By age 70, most men would already have symptoms of BPH.
The prostate is a male sex gland, located under the bladder. It surrounds the urethra, the tube that carries urine out of the bladder. Prostate helps make semen, the fluid that contains sperm. As you age, a male sex hormone called dihydrotestosterone (DHT) starts to build up in your prostate. DHT stimulates your prostate gland to slowly enlarge.
As the gland grows, it presses on your urethra – causing urination and sexual problems.