Basically that. Do your 6/7 year old DCs have close friends? Not just acquaintances, but proper "besties" for want of a better term.
DD is 5 and she has had a best friend since nursery and has developed other really close bonds with other children in her class.
DS is nearly 7. He has acquaintances, but (aside from his sister) has never developed any close friendships. We are about to start the process of an ASD diagnosis for him - I've seen the traits in him since he was tiny.
It got me thinking, have most children developed some close friendships by that age? Or am I just looking at the others in my DCs school but missing the bigger picture?