I started shooting snake's and rabbits with a pellet gun about 8 or 9 and went with my dad on deer hunts. He let me use my mother's 6.5 Swede for deer when I turned 12. Been out almost every year since. I'm now 69.
Killed my first big game, a whitetail doe, at 9 years old with my dad’s Marlin lever 30-30. I’m 27 now, so I started hunting 18 years ago. May have gone with my dad before 9. I now have that 30-30, and plan on using it for at least one more deer
Started shooting slingshots, pellet guns, and .22s when I was 7, started whacking squirrels and birds near my house in the early 90's at around 8 years old. Got my Hunters Education around 1998 so I could hunt quail and deer, killed my first deer at age 18 in 2003, so depending on when you want to start the time 32ish years hunting, with the last 20ish years being mostly focused on biggame and upland birds.