When you are standing at the altar gazing into your future husband's eyes listening to the minister talk about your future as husband and wife, don't picture the young and vibrant man in front of you. Picture less hair, a few less teeth, more wrinkles, an age spot or two... picture a few more chins and a couple of wiry black hairs sticking prominantly out of one ear and an even longer one out of one nostril. Gaze lovingly down and picture a little belly hanging over a somewhat shriveled and shrunken hoohoo.
If you can picture this and still want to marry this man, continue gazing into his eyes and say "I do...". :D