30. Started out with a Victorinox Classic some 16 years ago.
Started reading Guns & Weapons for Law Enforcement in 1998 and a bit of Tactical Knives in 2002, got to knew a lot of knife brands.
From 2002 to 2006, I had an initial learning curve about knives, Extrema Ratio Harpoon F got my attention, so did Spyderco ATR, Kasper Perfigo, CRKT M16-13 etc.
But Masters of Defense folders blew me away, in particular CQD Mark 1 and 2. Got the money to get a CQD Mark 2 in May 2006 and joined Bladeforums, learned more about knives and lurked on and off.
I bought some more folders that caught my eye in 2010 and became more active on BF.
I look for ease of cleaning, sharpening, tightening in a folder. A well-maintained blade is a pleasurable blade to use. Quality over quantity. Not too expensive, say under USD 300?
New steels, robust locking systems, handles are certainly things I would like to try out, but within my limited budget for knives.
A small wishlist of mine: Al Mar Nomad, Boker Turbine, Spyderco Police 3 G10, maybe a Leatherman Surge Multi-Tool. Maybe a CQD Mark 2 440C.
EDIT: Depending on availability and finances, an A.G. Russell Acies ZDP-189/Ti framelock would be nice.
Some photos of my puny collection: