feddit.org has a minimum age requirement of 14. It is focused mainly on german communities, but english communities are well allowed.

https://lemmy.zip/ allows 13+ users and its focus includes gaming
Sopuli and sh.itjust.works allow 16+ users too, and I doubt that dbzer0 will ask about your age

Lemmy.blahJ is been very good to me. LGBT inclusive and great. Just please avoid Lemmy world and shit just works ones, most toxic stuff always seems to come from them imo