Originally Posted by
Mr. BoH
I assume that is what American's website says?
Correct!
It's also worth noting that people ages 18+ are eligible to purchase (or redeem miles for) a membership on their own, or to be an authorized user on a Citi Executive account. So there are plenty of ways for young adults ages 18-21 to access the club at the same time as their parents; just not for free.