I would very well recommend
Hataraki Man but I see tsuyoshiro has beaten me to the punch. Luckily for you, that's not all that I've got to mention.
Moyashimon is not only an entertaining college-slice-of-life series, it's also quite educational.
EDIT: I wish being older means having more of the tools needed in life. I'm 2 years younger than 25, by the way.
Also, I believe everyone (who's old enough) must see
The Tatami Galaxy.