Even now in my old age I wouldn't mind a higher quality BB gun. I've been tempted to buy this one, lol!
It uses a battery system and gets good reviews.
Barra 400E.
https://barraairguns.com/cdn/shop/files/400e_polymer_001.jpg?v=1744401420&width=2000
55 years ago I started with a Daisy Field Master BB gun which was perfect for me at age 9.
Then a few years later a Crosman 760 multi pump but they were made better back then.
Then a German made Diana M27 youth sized barrel cocker pellet gun which was massively better made and much more precise!
I shot so much I broke all these but the Diana lasted 3-4 years vs a year or so for the others.
BB's bounce back because they are steel, depending on what they hit, and a kid I knew when I was a boy had his eye ruined by one coming back at him. Eye Pro is mandatory IMHO.
BB guns are typically 2-3 fpe whereas a youth pellet gun will be 6-8 fpe.
The pellet gun was the clear winner, the others just cheap toys if compared.
The really old Crosman 22 cal M140 pellet guns were decently made metal and wood multi pumps and they can be rebuilt. I had one that I won at a FT match which had just been fully rebuilt by Mike Baker out of Cottonwood AZ. I think this one would be good for the kid because one pump using a 14.3gr pellet is about 300 fps, and two is about 400 fps, then as he grows and he can handle pumping more it'll be about 700 fps at 8 pumps which will go right through a Cottontail rabbit 20 yards away.
The Benjamin and Sheridan multi's are similar.
I have a compressor so my grandson will likely end up with a cool little pcp and they have really neat ones nowadays. Wish I had one when I was a kid.
Actually I'm still a kid at heart so this year when my family goes on our annual camping trip I think I'll get one of these for us to play with at camp, along with some of my other pcp's of course, to shoot on steel and to do some hunting.