Old is when?

me and the missus were talking about a friend of hers who is getting a divorce
she was telling me that they have kids who are in their teens and it just didnt make sense to me, because i know we all went to school together

then i realized, WE have kids who are teens, and i graduated high school a quarter of a century ago!
I have grandkids that are teens.
I graduated HS a half a century ago.
I figured out a while ago, I'm closer to the big dirt nap than I am to my youngest son's birthday.
It goes faster every year.