Do people still use this site?

Yes, there are still users here from 2+ years ago.
This place ain't as active as it used to be though.
But 潮流粉丝俱乐部 is supposed to be getting a site upgrade though, so there's that to be aware of.

I left this site for 3 years, and came back a few months ago.

It's like a barren wasteland now.

I've been here since about '08 and I've seen a lot of users come and go. There aren't many, but there are still a few users around from the '08 era.

Mostly 13 年 olds.

this is my first 年 here. in August, i am getting a new account (might), and i will not be here in the summer. so i do not know how long people were on here on fanpop.

Yes, There Are Still People Who Use This Site And Not Just 13 年 Olds. Although It's Not Like It Used To Be. There Is Far Less Activity Than In The Past -_- !!!!

I'm relatively new here but from what I know there used to be much 更多 activity on this site in the past...

Ya people still use this site. I am a user from 2011. Like other people have 说 users come and go but people generally still use this site and it's not just only 13yr olds.

I've been here since 09. A lot of older users are gone, but the site is still relatively active. Ish.
I wouldn't say it's mostly 13 年 olds, but probably in the range of 15-17 with a few outliers.
Not in the way it used to be, though. It's pretty dry compared to before.
But hopefully new features may bring a much needed breath of life here.

The old users still exist, but there aren't very many of us here anymore. :\

Haha, I took a hiatus about that long too. But, even though it isn't super active, I have found some new 老友记 here.