The job of the prostate gland is to secrete a fluid, called prostatic fluid. When you ejaculate, the prostatic fluid is released, and mingles with the sperm. This fluid contains nourishment and protection for the sperm. As you get older, your prostate gland grows larger in size. As a result of this enlargement, your bladder has to work harder to force urine past the large prostate gland.
Most men notice they pass a reduced stream of urine as they get older.
However, some men may also notice that they take some time to get going, and the stream may stop and start. They may dribble after finishing and are often left with a feeling that their bladder is not completely empty. They may need to go to urinate very frequently, and may need to get up several times in the night. Some sufferers become reluctant to go out of the home, because of needing to go to the toilet so often. They become tired through lack of sleep, and feel in constant discomfort Very occasionally, they become unable to pass urine at all.