When I was quite young, I typically never even carried a key to the house. Either someone was home already, or I'd stop at a neighbor's house, or just play outside until somebody showed up.
In Africa, it was pretty much the same. Sometimes I'd have one of those old round keys, but usually not.
In the States I had a dorm room key that I just kept in my pocket. In grad school, that turned into keys for the office, car, and apartment, on a ring in my pocket.
That's not the best way to carry a key ring, and I found myself sewing up holes in the pocket. My usual warning was feeling something falling down inside my pants--usually dimes. Sometimes (confession here) if I was in a hurry, I just used a stapler to fix the pocket. Yeah--don't do that. It works for a week or two, and then the holes get bigger.
At work I needed building, office, library, lab room keys, as well as 2 locks for home, and car keys. And a few additionals--bike lock, etc. I got a belt clip and hung keys off that.
More responsibilities, more keys. Not so many as the janitor or our chief engineer/building manager, but heavy enough.
Then I learned that hanging that much weight on a car's ignition switch could, and in my case did, loosen something in the lock mechanism that would keep it from turning. Car keys went on a carabiner that hung from the main key ring.
When I started traveling overseas for work, I divided the keys into personal and work rings, and hung one from the other, taking off car and work rings when I traveled.
Yes, it was messy, but my fingers learned where to go. And I generally left the work key ring in the drawer at work.
Retirement removed the work keys.
Dropping to one car removed one key from the carabiner, though I still carried a lockout key for some of the son's and daughter's cars.
And now the carabiner and car keys go on the dresser top. The belt clip's ring feels a bit naked without the extra dangly part. But the chemo and associated meds leave me too drowsy to safely drive.
I can probably safely remove another 3 keys from the remaining ring too.
There's a history in the keys in the dish too, if I could remember which was which anymore.