Growing up doesn't affect anime. I still watch yugioh, pokemon, and all those shows from my childhood once in awhile. And I plan to watch several series from start to finish, like beyBlade, the first few seasons of Digimon, first few seasons of YuGiOh, possibly Dragonball and Dragonball Z.
Also, YuYu Hakusho was simply awesome. I remember watching up to the point just after tehr dark Tournament, but then i downloaded it all and watching it from beginning to end in about 2 weeks. It was brilliant
Soul Eater is also one I'm watching, I think I'm up to episode 22.
Lucky Star is one I plan to watch, I love pointless cute shows like that. And Azumanga Daioh was just hilarious XD
Some others on my list to watch eventually are:
Sayonara, Zetsubou-Sensei- It's a hilarious one about a depressed teacher who often tries to kill himself and about his disfunctional students.
Sailor Moon- Classic series that I never did finish. I ended up losing track after they killed Queen Beryl from the Negaverse.
Rurouni Kenshin- Just a wonderful series, and I love the atmosphere of it.
Then there are a bunch of newer shows that I want to watch, but I will wait until the first season is done.
Ah! My Goddess- A beautiful anime with a really lovely story. I finished the first season, working on the second.
Ah! My Buddah- No, it's not a sequel, in fact, they are barely even related. But it looks like a great series.