What's the "youth anthem" of your generation? That song that's all about being young, having fun, enjoying life with friends, and all of that; that was unofficially adopted by your generation as THE song that represents them, and that ALWAYS has to be played at any party, and that is likely to by played even at a 50 years highschool reunion.
For my generation, this is that song:
https://www.youtube.com/watch?v=9BOdk9IV7Kc
For people about 5-10 years older than me, it's this:
https://www.youtube.com/watch?v=1A6nCZrPA2U
For my parent's generation, it's this:
https://www.youtube.com/watch?v=fcokoGjTpCQ