Originally Posted by
Bored at 3:00AM
It depends on the Superman. The Golden Age Superman and those inspired by that incarnation like Earth-2's Kal-L and Morrison's T-Shirt & Jeans Superman don't really learn much about Krypton until adulthood. Same deal with Byrne's Superman. However, every incarnation aside from those has learned about more detailed information Krypton during adolescence.
Both work depending upon the story being told and the type of Superman needed for that story. In the current Superman Versus The Klan story, Clark's spotty knowledge of Krypton is crucial to the story. On the other hand, most Superboy stories generally lead to Clark gaining much greater understanding about Krypton.