I used to work at a YMCA, and the local homeschool group asked us to do a PE class, which I taught.

I had the kids doing swimming, rock climbing, and all kinds of traditional PE games.

I worked with "normal" kids most of the time, and I will say the homeschool kids stuck out. They're more awkward around kids their age, but far less awkward around adults. They know how to speak and act, in large part. And they were disproportionately ahead of their peers academically--though I think that's probably a selection bias for the parents seeking out homeschool PE classes.

This was in the early 2000s, before Facebook. I'm sure the avenues to connect have only grown with social media.

> They're more awkward around kids their age, but far less awkward around adults. They know how to speak and act, in large part.

This is another argument that "by age" is not the best way to find one's academic or social peers.

Some people in 2nd grade should be in high school. Some people in high school should be in 2nd grade. (And, academically, sometimes that's different by subject; some people need to be in 2nd grade math and high-school reading.)

I was a TA/lab-assistant at the community college I was attending. I spent a lot of time talking to and helping out people, universally older than me, who had gotten out of high school and needed to figure out where in a multi-year curriculum of remedial math they should start.