Well.......thats an interesting question......I think a lot of people see those they talk to in high school as their "friends" when most of them only see each other in classes or events that are school related.
If you have REAL friends in high school normally you stay in touch with them.
The rest leave and go to college together, party, have drunk stories to tell and end up leaving school without having learned a thing. LOL
Can you tell I think the "college" experience is LAME!!! Most dont learn a damn thing.
Anyway, no, you normally dont stay close with many. Just a few.