Just one last thing before signing off (at least in this thread)... And, yes I do think we are diverging...
My point is not about having children of different ages socializing in the same group (that including internal structure of a family and structured class rooms etc.). For anyone who is aware of my rambling in these forums, I am an advocate for mixed culture, diversity and cross-training, etc. So, obviously, I also think interaction between different ages is all good (so long it's kept orderly and clean).
But... My response was about a younger child (yes, 5 yo - a toddle, not a 8/9yo and not a preteen, a teen or whatever) trying hard to fit into and idolizing an older age group.
I'll shut up now.