Who's changing the dirty diapers?

An article on "Grups", i.e. people who never grew up beyond age 15...

But it mentions kids "Grups aren’t afraid of parenting....Grups love kids. In part, though, this is because Grups find kids to be perfect little Mr. Potato Head versions of themselves. “I recognize that changes and sacrifices are necessary. I do occasionally wake up before nine these days,” says Pollack of parenthood.

And then you have this: the utopia of the future: Tennis at age 150...

Ah, but who is changing the dirty diapers? Or sitting up all night when your kid has a fever?
What's missing from this picture....Sickness, injury, sorrow, and death...

Oh, I wanted
never, never to grow old...
Listen: New Year's Bell.