Op, we don't want DS to move up. So it's not everyone.
Same for me.
Though when thinking about it, my mom should have held me back. I was in NO way mature enough to be so young in my class the whole way through school. But then they allowed October birthdays (I was actually be second youngest!). Alas my single mom worked and literally used school as a place to send me for free during the day (if she'd been a woman of means she would have homeschooled me, she told me years later) so the earlier the better for me.
It's 3 through 12, to be precise.
My son enjoys the Lab activities, but he absolutely agrees with that. It really soured him, especially after he experienced Royal's kid club and the counsellors who do NOT talk down to the kids. And both Royal sailings we've been on they have combined the 6-8 and 9-11 clubs so it's not like they don't have younger kids in there.
And both of them could have been in the club/lab and met there.
I'm guessing the op sees desperation and that's why she used the word. She needs to look around and see that there are likely plenty of kids not being moved up, and stop focusing on those who are.
Said 10 year old needs to stay in the Lab. Thats what DS has done and he avoids most of the littles that way. But he doesn't mind little kids.
I really disagree with 9-10 year olds not wanting to play but wanting to chill. I think that behavior is a school thing. Once kids are away from that need to look cool and not show their essential kid-ness, they are very silly and into playing. Since we go to the Ymca and I'm around 8-18 year olds almost every day because of DS's dance classes and company, I see how goofy and kid-dish they are. And he's one of the only homeschooled ones so that's not the reason. There are kids of those ages interacting, from different schools and grades, private and public, elementary and middle and junior and high schools, just having fun.
My son loves dancing on colored squares because it's dancing. He makes lots of friends who have protested when we come to pick him up, because they are having so much fun with a boy who dances. He loves the Piston Cup thing and Get the Hook and the cooking classes. He likes super sloppy science (though that's where the "talking down to kids" has been the worst). He ignores any coloring events. So those don't bother him because he ignores them.

. On Royal the counsellors have loved him because he will throw himself into the activities. On a cruise where he only started going to the club on day 4 of 7, he was crowned King of the cruise because he was willing to jump on in. He also tells me that in the talent portion of the last night he "broke out The Worm" while dancing and that clinched it. He has a ton of fun doing the time-honored his-age activities. Though he says
DCL does gaga ball wrong lol.
And he is not the only kid of his age having fun. The kid who sits in the corner sulking because it's too babyish, on Royal, stands out because s/he is one kid. The rest of his/her same-age kids are all out on the floor, participating.
Ofinn I hate to disagree with you, I really do, but if DS even at 11 started telling me that he just wanted to sit and chill and not play, I'd tell him that he's a kid, playing is what kids do, stop trying to be 16, and go run around. If he balked then I'd introduce him to what being adult is like; perhaps we would sit in the stateroom and balance a checkbook or read a book quietly. If being a kid is too babyish for him, then he can just graduate straight to adulthood.