Currently 21.
My dad gave me my first pistol, a Ruger single-six, when I was about 6...as far as I can remember. Still have it sitting in a drawer waiting for my kids to come along.
A little later, he got me a bolt-action .22LR, the make of which I cant recall off the top of my head, but I still ahve that two...leaning up in a closet somewhere. When it got too short for me, it was replaced with a bolt-action marlin, which I shoot to this day.
From the pistol I moved up to a colt 1911 series 70...a gun that set the standard for everything else that has even sat in my hand. Now that Im old enough to buy my own, I did my best to replicate that feeling and ended up with a springfield armory milspec, which is a decent replacement, though smaller.
About 15 years now, I figure...though I wouldnt say its been a consistent thing.