When I read this, it didn't sound like George Carlin to me. Mostly just not funny enough. I tried Googling "George Carlin on age", and came up with the same thing, which others also doubt was George's. I also found this:

George Carlin posted on his own web site about such soapboxings:

DON'T BLAME ME
Floating around the Internet these days, posted and e-mailed back and forth, are a number of writings attributed to me, and I want people to know they're not mine. Don't blame me.

Some are essay-length, some are just short lists of one and two-line jokes, but if they're flyin' around the Internet, they're probably not mine. Occasionally, a couple of jokes on a long list might have come from me, but not often. And because most of this stuff is really lame, it's embarrassing to see my name on it.

And that's the problem. I want people to know that I take care with my writing, and try to keep my standards high. But most of this "humor" on the Internet is just plain stupid. I guess hard-core fans who follow my stuff closely would be able to spot the fake stuff, because the tone of voice is so different. But a casual fan has no way of knowing, and it bothers me that some people might believe I'd actually be capable of writing some of this stuff.