[Solved]Where to store user info after logging in

[eluser]Sim00n[/eluser]
Hello,
My problem isn't complicated at all but it's more kind of an organization struggle.
I'm creating my first real Codeigniter application and I stopped at the point when I don't know what is the best way to store information about user.

After a user logs in I'm storing it's username and userlevel in a session (through database), but what about the other info like age, city, and ~ 20 others ... I think storing those in the session is too resource consuming so where else can I store them ? I don't want to call a function to retrieve it from database every time i need to use those information.
Any ideas ?
Best regards, Sim00n.