I just turned 26.
I got into Buffy around 2010. I had made a new friend and we didn't know what to watch on TV when I was hanging out with her one afternoon. She asked me how much I liked Buffy (Take note, not had I seen Buffy, how much I liked Buffy) I replied saying I had never seen it. Well, that led to being shown all different episodes in one afternoon (stuff from season 6, season 1, season 4)
Needless to say I got hooked and after another afternoon of watching random eps she had finally let me start from the first episode of season one. A good portion of our friendship was thanks to Buffy I think- from spending hours watching Buffy together to travelling to conventions to meet the actors.
She had been a fan since she was 12 (and she was 6 years older than me) It was cool, she had heaps of Buffy books and magazines.
Our mutual friend was a fan too. We kinda had a cool group going- my new friend, mutual friend, and new friend's brother (who also became one of my closest friends). So sometimes if we weren't playing video games, we would watch Buffy or Angel. So that was awesome.