I was in the same boat. Everytime my windoze box would get so problematic that I was looking at a clean install and starting over fresh on an outdated box I'd price shop and find that I could buy two new windoze machines for the price of a Mac. After doing this about 4 times I finally paid the money. I was getting about 2 years on my windoze boxes before I couldn't stand to use them anymore, registry corruption, glitches that a fresh install would fix, etc. My Mac is right at 9 years old now and I still have no desire to run out and get a new one. I'm stuck at High Sierra because the hardware is that old and I'm sure it'll run for a year or two more at least unless I have a hardware failure. So I'm actually money ahead and wish I'd done it sooner. It does have a quad core processor and 12gig of RAM and I did upgrade the HDD to SSD just for the speed, so it'll likely get me past 10 years. I've never seen a windoze box that's used daily with multiple windows running constantly go anywhere close to that long. They are usually just too slow to deal with long before that. At least for me. YMMV.
