I am 61, have carried a pocket knife every day since I was 8, except after 9-11 and have to pack to checked baggage when flying, usually twice a year.
My first two knives are at home somewhere mom's care, a small case with stag slabs and a Cub Scout knife.
Since college a small SAK (red) has been with me and was upgraded to an executive model when about 40 or so. I lost that knife[emoji29] just a couple years ago.
My first tactical was a Emerson CQC7 (did not know that until 3 years ago) that I purchased as part of a flea market bundle with 2 other SAK multi-tools for $80, back in 2001 or 2002.
I just liked the feel and that blade appeared to be stout and sharp.
When I was removed from my mngmt position and searching for work landing in a construction type setting, then I realized the work the larger blades could assist me daily.
Unfortunately my CQC7 walked away from my other tools at a job site while pulling cable 2 years ago.
Tried several other folders to replace it with a Leatherman CL33 doing well until a CQC-4K was acquired a couple weeks ago. I fits my jean watch pocket and stays with me not my tool bag.
Still, I am fond of any knife that catches my eye, feels good in hand, and if it bites me while handling, then I know it will be mine. I do not handle many expensive blades (+200$) for that reason.
It is and will be about what I like, not what is popular.
At 30 maybe be are now starting to mature[emoji6]