What’s the first time you realized you were an adult?

What moment made you realize you’re no longer the latest/newest generation, but you’ve become an adult and there’s a new generation growing up after you?

For me I was in my earlier twenties, and a kid told me with curious awe «did you know that many years ago some man killed like a hundred people?». He was referring to the 22nd of July attacks, 2011. I was in the capitol and saw the bomb go off. That was the first time I realized there’s a whole new generation of kids already here who weren’t self aware or even alive when that happened, but they’re now old enough to talk about it like it’s history.

Do any of you have similar moments of realization?