it is a bit unusual. of the main people in my life, my 'family', one I met in 84, another in 87, one in 89, one in 94, and one new addition from just 3 years ago. On the other hand, never kept in contact with anyone from high school or college.
People change, what you had in common with someone 10 years ago sometime isn't there anymore... the older we get the harder it is to make friends; then again there's people I met in person on here that are pretty cool and if we were closer, we would definitely hang out on weekly basis (viva the internets)...
my wave of friends... high school (none survived), college in MTL (my closest friends but rarely see them), Stanford...well none I would invite over for diner but would definitely keep in touch for career sake...