I recently rewatched Avatar, the last Airbender

and its unbelievable how good the show is for any age. the characters are more realistic and have a better arc and develoment then most modern productions.
the world building is incredible, the society is almost believable how bending is integrated into everyday live.
and the story doesnt sugarcoat things, it puts on a different angle, the fire nation isnt mindless evil, the joy rebel is hurting innocents, and the mistreated poor old lady seeks a terrible revenge in bloodbending.

no matter your age.. you should watch this show, or watch it with your kids