I have enjoyed this discussion on knife size, weight and carry. I have been there.... and it all depends on what you normally do with a knife and of course what you like. I seldom do "power cuts" much anymore where a hand filling folder is important. It was a knife choice criteria for years and years. Now I have settled down and carry a small knife or two and they do everything I need doing with a knife. I still have a yearning for the big traditional folders, but I seldom really need one any more.
Life was so much simpler when I owned one knife and that was what I carried..... I got along just fine.
So, your age and assuming you might be less active than when younger, impacts knife choice, what is more tolerable in your pocket (weight and size). I love knives but I have a very hard time justifying carrying anything other than a Vic Small Tinker any more. I did start carrying a little fixed blade all the time and that has resulted in using the SAK much less for cutting. It is to the point that sometimes I question why I have the little guy in my pocket, but it takes up very little pocket space. So, it stays.
Age definitely has a lot to do with it. Totally. Absolutely.
My choices of knife carry now are a universe apart from what I carried in my 20's then 30's. My knife carry in my 40's started to change even more. Now as an aging septuagenarian, my knife choices have zero resemblance to what I carried 40 years ago. Or even 30 years ago. And age aside, my lifestyle has changed even to a whole other part of the country with different terrain, and hazards while outdoors. Every decade older was a step down in size.
Even being a retired senior with now unlimited time for fishing, woods walking with my wife of almost 50 years, and as much plain old screwing off and loafing that I never had time for in my younger day, I need a knife now ,more than ever. Fishing, dealing with fishing line, woods walks, teaching grandkids how to make a great hot dog stick, how to make tent pegs from sticks, all need a sharp pocket knife. With time to travel now, we go on cross country drives to our daughters place in California, our two sons places in Maryland, sight seeing and camping in between.
I've tried the small fixed blade thing a couple of times, but I keep coming back to my default setting that is a small pocket knife in a size that fits in the coin pocket of my jeans. Getting older, you get to realize your limits more and live life a little more carefully. I don't need as much knife as I used to carry because I'm not in situations where I actually need one. As an arthritic old fart, I know I will never see the real wilderness again, and thats okay. Been there, done that. Now at this stage of life, its nice to take it easy and watch Old Faithful from the veranda of the Yellowstone Lodge with a cocktail in hand. The most strenuous knife use there was spearing an olive from a martini glass.
On our trout fishing trip to Mammoth Lake, teaching our granddaughter how to tie a blood knot, the hardest knife use of the day was the SAK classic scissors trimming the line. When the fish were processed for cooking, my son-in-law had a Martini fillet knife that worked pretty good.
Once you reach the stage of life that you know you're not going after Chinese paratroopers, or going to be marooned in some far off wilderness, you don't really need much knife at all in modern life. Age has a way of dissolving illusions and delusions.