Bonus points if you know what it was. Also can break down as to rimfire, centrefire, handgun, longarm, etc.
13 years old, Marlin Golden 39A. .22LR
13 or 14 years old, Ithaca side by side 16ga
14 years old, Winchester 1894 carbine in .32 Special. Might have fired a Winchester 1892 in .25-20 previous to that.
Handgun, both centrefire and rimfire, age 14 during hunter safety classes.
I’m extremely embarrassed with my late start in life, as in other threads, I noted many of you have been firing firearms and experimenting with incendiary devices since about kindergarten.
I’ll forgive y’all if I’m forever banished from this forum because of it.

. My late start has a reason. My father was a LEO and we were not allowed to play with toy guns as kids as my father reasoned correctly there’s no place for toy guns and “when it’s time” I could have a real firearm. And, one Christmas, there was a Marlin Golden 39A, which I still have. Bought used and with condition, the same thing I do today (I’ve never bought a brand new firearm).