I'm reminded of the old joke "I've got underwear older than you"
I'm 44, and the oldest knife I still have is a little Valor lockback. I bought it from a friend when I was eleven. It's got a 1" blade with "American" etched into it, and it used to have white/yellow-ish micarta scales. The brass pins holding the handle scales on were corroding and turning the scales green so I removed the scales and replaced them with black plastic ones I made. It's not a quality knife, poor fit and finish, but it was still quite useful for a knife of it's size (and it still could be). That knife was a prized possession that went everywhere with me and it saw a lot of use. And considering the fact that I wasn't always careful with it, it's really surprising to me that I never broke the tip off the blade (of course I treat my folders much better now). It was also a pretty "lucky" knife as I lost it twice (away from home) and both times to my incredible surprise it was returned to me.
I had several other knives before that, but they were mostly cheap junk that fell apart or were discarded over time for being cheap junk. My dad brought home several Camillus TL-29 electricians knives from work and those Camillus all-stainless steel "camp" style folders (blade, can opener, screwdriver/bottle opener, awl). I sold most of the TL-29's to other kids. Some were brand new and well-made, I wish I had kept at least one of those.
Around the age of eleven my uncle gave me a Schrade switchblade. The spring eventually broke and I sold it to a friend who still thought it was cool.
Around the age of twelve I received a Buck 110 from my parents. Back then the 110 was a big deal so it was a prized possession. I still use it to this day, and it's still a prized possession. It still has it's original, unbroken blade and locks up rock solid. The pivot loosened up once or twice over the years from frequent use, but a few taps on the bolsters with a hammer, and then a few taps on the pivot pin tightened it back up good.
Good idea for a thread Kenny.