Men usually buy guns for themselves, with little or no thought of what is best for the child:
Length of pull
Trigger poundage
recoil
recoil management system(s)
To mitigate the above issues, there was a family tradition, no young man got his first full-size shotgun or rifle until the age of 14 when he was able to use adult guns. My great-grandpa's double barrels were never fun to shoot, and for this reason, I never gave a hoot about nostalgia, all I knew was that "thing" hurt me. Great Grandpa got a 20ga in his older age, and that double barrel was what I loved, but even it hurt.
Today, the Beretta 20ga is a dream come true, and has half the recoil of the same in the Benelli. If you ever own a Beretta 20ga, you will never sell it.