1. Rachel McAdams is now seven years older than Amy Poehler was when she played her mum in the movie.
When Mean Girls was released, Poehler was 31. McAdams is now 38.
2. If you were born before 2000, you’re older than Lindsay Lohan was when Mean Girls was filming.
3. And Cady Heron would now be nearly 30 years old.
4. Regina’s little sister Kylie now looks like this.
5. Now aged 20, she's also now four years older than the main characters were meant to be in the movie.
6. The movie came out three years before the first iPhone was released.
7. When the movie was being made, Facebook didn't even exist yet.
8. Diego Klattenhoff, who played Shane Oman, is now 37.
9. As of next year, there will be teenagers who are younger than this movie.
10. By the time the movie came out, we were only on the third Harry Potter movie.
11. The song Damien sings at the Winter Talent Show is now 15 years old.
12. Playing Karen was Amanda Seyfried’s first film role; she's since acted in 26 feature-length films so far.
13. And she's also now a mum!
14. When Janice and Damien are staying in on Halloween, they're watching VHS tapes, which stopped being sold four years later.
15. Rugrats was still releasing new episodes at the time Mean Girls was released.
16. And the No. 1 song in the UK when the film was released was "Burn" by Usher.
17. The youngest of the "junior plastics" is now 25 years old. The others are 26.
18. And finally, the year 2030 is as far away from us as the year Mean Girls was released.
