Calvin and Hobbes by Bill Watterson for July 10, 1990
Transcript:
Calvin: Ever notice how the older people get, the slower they do things? I wonder why that is. I would think that the less life you had left, the faster you'd want to do everything, so you could pack more into the remaining years. You can bet when I'm a geezer like Dad, I'll be going like a maniac. Hobbes: Oh great.
Geezerhood starts at 15 years older than you are—which is why Dad is a geezer. But, when Calvin is 30 or so, like Dad now, it will be much younger!