I'm going to say 10-ish maybe a year earlier ...my Dad and I shot 22's Rifle & Revolver & 32/20 Revolver together before that, it was about 11 for a double 12 gauge as I recall.
I was given the 22 rifle @ 8, Circa 1956 as I recall . It was then about a 20 year old Remington Model 341 Sportmaster I still own.
(built by Remington Arms for only four years prior to World War II.)
Until 10 (1958) I shot it with supervision , cans , bottles never anything living.
I don't feel like I missed not hunting at least no regrets in that aspect, there was just no necessity.
But ridding the world of evil tin cans & glass bottles was and the odd old paint bucket or two down in the Keys.