The first linux distro I remember using was Ubuntu 6.06 (Dapper Drake), so I’m just about at 20 years, maybe a bit less than that; I think it had been released for a while before I decided to give it a go. I tend to stick with debian-based distros, though I’ve used arch variants off and on for my daily driver for years at a time. Still got it kicking around on some machines now, though not any of my daily drivers. Servers are a mix of Debian and Ubuntu Server, machines with UI are either Ubuntu or Mint, or some resource-light version of Ubuntu, depending on the device and the mood when I last reformatted them. I have used Fedora/RedHat/CentOS at various points, but usually because someone was paying me to do so. Same story with OpenSUSE, but even less commonly. I have a few devices running variously dated versions of PostmarketOS, Lineage OS, even one device that still runs CyanogenMod (it does not get internet privileges). I have a few Raspberry PIs that all run Raspbian (or whatever it’s called now).

EDIT: Just remembered I used to use CrunchBang Linux for a long time. I bought the only computer I could afford (a “netbook” with Win 10 Starter), put crunchbang on it (after experimenting with a few distros), and really kinda fell in love with OpenBox. I don’t use it anymore because I don’t like the default settings and haven’t been bothered to set it up properly lately, but I had that netbook set up just so and it worked really well. it was my main and only computer for several years.