This. My dad got me a little model 7 in 243 when I was 10, that thing knocked my socks off.
I’m so thankful that he didn’t get me into anything bigger, the 243 was plenty of recoil, anything bigger and I wouldn’t have liked to shoot, and I was a big kid.
Things probably would have been different with a suppressor as it makes shooting so much more enjoyable, easier, and scrubs so much recoil, but pretty much nobody had them back then.
*maybe* a kid could be alright with a suppressed 6.5 creed, but they would be much better off with a suppressed .243 or 6 creed.
My kid will start with a suppressed .223 and probably use that until he is ready for his drivers license, state laws aside there’s little reason to move to anything bigger.