My PSU is only about 8 months old. As for the other two I'm not certain I will verify later today when I'm on my computer, but I believe I updated to the latest version of windows 10 just yesterday.
Last Christmas, I built a pc with brand new components. I managed to replace everything except my GPU which I took from my old pc.
Recently, the system has been restarting randomly. It's happening completely at random, whether the system is under stress or not. It can happen 1 to 2 times a day...