Our expert says:
“Penis Size. Weight gain is common as men grow older. As fat accumulates on the lower abdomen, the apparent size of the penis changes. "A large prepubic fat pad makes the penile shaft look shorter," says Ira Sharlip, MD, clinical professor of urology at the University of California, San Francisco.
"In some cases, abdominal fat all but buries the penis," says Ronald Tamler, MD, PhD, co-director of the Men's Health Program at Mount Sinai Hospital in New York City. "One way I motivate my overweight patients is by telling them that they can appear to gain up to an inch in size simply by losing weight."
In addition to this apparent shrinkage (which is reversible) the penis tends to undergo an actual (and irreversible) reduction in size. The reduction in both length and thickness typically isn't dramatic but may be noticeable. "If a man's erect penis is 6 inches long when he is in his 30s, it might be 5 or 5-and-a-half inches when he reaches his 60s or 70s," says Goldstein.
What causes the penis to shrink? At least two mechanisms are involved, experts say. One is the slow deposition of fatty substances (plaques) inside tiny arteries in the penis, which impairs blood flow to the organ. This process, known as atherosclerosis, is the same one that contributes to blockages inside the coronary arteries a leading cause of heart attack. Goldstein explains that another mechanism involves the gradual buildup of relatively inelastic collagen (scar tissue) within the stretchy fibrous sheath that surrounds the erection chambers. Erections occur when these chambers fill with blood. Blockages within the penile arteries and increasingly inelastic chambers mean smaller erections.
As penis size changes, so do the testicles. "Starting around age 40, the testicles definitely begin to shrink," says Goldstein. The testicles of a 30-year-old man might measure 3 centimeters in diameter, he says; those of a 60-year-old, perhaps only 2 centimeters. “ - http://men.webmd.com/features/life-cycle-of-a-penis
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