Great message from Lewis Black. In 2006, I interviewed Norm MacDonald and he said basically the same thing about old actors:

GM: I heard that when Paul Reiser went around to pitch his film with Peter Falk as his dad, they would say, “No, how about you’re the father with a young kid?” They didn’t want Reiser being the son.
NM: That’s terrible. Imagine not wanting Peter Falk.
That’s crazy.

GM: Well, you know, they’re thinking of the kids.
NM: Yeah, I know, but my kid, I show him old shows and he loves them, you know? I show him The Honeymooners and Get Smart! Because when I grew up, young people weren’t the stars of TV shows.

GM: That’s true. We’re the same age. I showed my
nephew, who was seven at the time, Horse Feathers
starring the Marx Brothers. He loved it.
NM: Oh, that’s great.

GM: The next day I woke up and he was watching it
again.
NM: That’s great. Yeah, my kid’s favourite show, I
just watch Beverly Hillbillies with him all the time.
And they’re all old and ugly and it’s hilarious. So I
think kids would still like that. It’s the same with
writers. They get young writers, too, in Hollywood,
you know, to write which is really nuts because
they’re not even on camera. And obviously older
writers are better than younger writers. It just makes sense. Like, novelists are all old.

GM: And they were all young once. The young people were never old.
NM: Yeah! That’s a good point! I never thought of
that. Yeah, you’re right. But that’s their thinking
here. That’s what’s good about standup. It’s just you,
you’re completely responsible and you can say whatever you want.