Since I originally built it, it's undergone dozens of upgrades: close to a half dozen motherboards, a few more CPUs, several GPUs, lots of RAM, drives, etc. I think 3 cases, and at least that many power supplies. But it was never all at one time. I definitely did a couple generational upgrades that were nearly everything, but stopped short. There's literally nothing left from the original build.
The parts were always then passed down to other uses: builds for other people, or a server in my basement.
This year, due to a failing motherboard, I did probably the biggest upgrade I've ever done at once; including AMD over to Intel, new case, SATA SSD to NVMe, but still but full: I kept the power supply (I hust bought it a couple months earlier, thinking it was the thing causing me trouble) and GPU (impossible to buy something reasonable).