We have had our best luck with finding friends outside of school. My son participates in a Pokemon club and all of the kids are significantly older than he is. We also belong to a homeschool group even though he's not currently homeschooling. The kids there range from 3-12. They have events on the weekends and in the evenings on occasion.

DS6 isn't really inclined towards one "best friend" at this point though. He has differing friends for differing activities and seems to be fine with that for now.

Shari
Mom to DS 10, DS 11, DS 13
Ability doesn't make us, Choices do!