T'other night, I was listening to the Arch on my way home from work
(gratuitous plug: I like their format and their attitude). There was a
recorded call-in that went something like this:

"Hi, I'm Stacy, I'm 23 years old, I grew up in the eighties, and I love
the Arch."

Now one of two things is true here. Either I misheard her, and she said
33, or she's using "grew up in" in an entirely different way than I do.
I consider myself to have grown up in the eighties, and I'm almost
fifteen years older than 23. When I say "grew up in", I'm thinking
adolescence, not childhood. I turned 12 in 1980, and was 21 at the end
of the decade.