Most anime is made for kids and teenagers, and I'm growing out of them now. Probably gonna move on soon, but I want to catch one last anime high.
Some things for adults that I watched already:
Cowboy Bebop
Kino no tabi
Monster
NHK ni youkoso
Initial D
Patlabor movies
Black lagoon
Kaiji
Some others that are made for teenagers but feature adult MCs:
Drifters
JoJo's
Gurren lagann
Berserk
Fist of the north star
One punch man
Hellsing
Also I've got GITS, Psycho Pass, Texhnolyse and Ergo Proxy on my radar, but I'm not in the mood for cyberpunk stuff for now.