Well, this thread is 8 years old, but since somebody reactivated it, I thought I'd mention my own mnemonics...
9,22 is important enough to remember, but FA suggests remembering "Philadelphia CreaM cheese" (CML)
I remember 11,22 (Ewing's sarcoma) by thinking that Patrick Ewing used to get about 22 points and 11 rebounds a game... and it happens between ages 11 and 22 (not precisely, of course).