Offspring

Kelly: The invitation says the party starts at 6, but you don't have to come that early. That's just for our friends that have to leave early because of offspring.
Kevin: Offspring? Your friends are going to an Offspring concert?
Kelly: No, offspring, like kids. They have kids and can't stay out late.
Kevin: Oh! Ohhh... oh.

This conversation was an important reminder that people my age get married and procreate. I tend to avoid people like that - really gets in the way of partying, evidently.

At first I judged the hypothetical people who spent money to see a band sing "Pretty Fly (for a White Guy)," but even that seems like a better alternative than having to get home to a toddler.