I graduated college in 1999 but I didn't really start getting obsessed until 2000 when No Strings Attached came out. I was 22/23, which basically just means I still screamed like a 12 year old but had money to buy my own concert tickets and travel to different cities to see them vs relying on my parents.
This! I was 19, but didn't have money to get to a concert. I had a friend who massively loved all teeny-bop music and she always played the whole rotation so she got me liking some of it. 'No Strings' was where it was at though, no question.