To switch places, the implication is I'd not have my kids. I can't fathom a life without them. Perhaps it didn't need to be added as a qualification.

I don't have em, but having adult children when you're older and the experience of being a parent both seem like they're intrinsically valuable. I have a hard time believing any 18 year long cohabitation wouldn't form something of value, and struggling to deal with a problem together is a textbook team building exercise, for better or worse.