WHY ARE "ELDERLY" AND "80 YEARS OLD" USED IN THE SAME JOKE?

An elderly gentleman went to the local drugstore and asked the pharmacist for Viagra.

The pharmacist asked, "How many?"

The man replied, "Just a few, maybe a halfdozen. I cut each one into

four pieces."

The pharmacist said, "That's too small a dose.That won't get you through intercourse."

The old fellow replied, "Oh, I'm well past 80 years old and I don't think about sex any more. I just want it to stick out far enough so I don't pee on my shoe