I have a few PCs running Windows 10 that are older than 5 years. As long as they have SSDs and you're not gaming, they're still plenty fast, even for modern websites.
I have a macbook that's 8 years old with an ssd and 16gb of RAM. Only struggles with gaming on the integrated graphics, and the battery life has always been abysmal with the thirsty 35w i5 cpu.