Old fellow goes to the doctor...

"Doc, I need some help... I can't make love to the wife very often"

"How often do you do it, John?"

"Oh, maybe once every week or 10 days."

"Well, John, you're 74, that's not too bad for that age!"

"But Doc, my neighbor is 81, and he says HE does it twice a week!"

"Well, John, can't you say the same thing?"