saveourearth perhaps? Assuming that "much younger than my character" refers to teenagers and children, we're a pretty good fit - more characters are over 25 than not, and we have a good spread across all older ages.

It's an AU/mem-loss game, with the premise of people being reborn onto modern day Earth after the timeline of their universes ended. AC is 10 comments and it's on DW, but we have no castmates for you.