I'm 29. I got my first knife when I was about 6. I have collected knives ever since.
I remember going to gun shows when I was very young and my parents would always buy me a knife. My Mom and Dad are truly cool parents! I remember one time when I was 9 or 10, me and my brother were playing mumbledy peg with a folding fishing knife (ouch!), and I accidentally stuck it through my foot! My Dad just put some iodine on it, wrapped it with tape (I think it was electrical tape), and said "there ya go, good as new... now be careful!" Told ya they were cool!
Over my 29 years, I have owned a CRAPLOAD of knives. Right now I'm kinda stuck on actually using my knives, so whatever doesn't get used, gets sold.