A college student challenged a senior citizen, saying it was impossible for the older generation to understand his.

“You grew up in a different world,” the student said. “Today we have television, jet planes, space travel, nuclear energy, computers… “

Taking advantage of a pause in the student's litany, the geezer said,

“You're right. We didn't have those things when we were young; so we invented them! What are YOU doing for the next generation?”