I'm not surprised...
Windows 7 is *excellent*. Why would I want to change it? I have Windows 10 on my work PC, and, well, it's okay I guess, but the flat user interface just leaves me asking "why?" and continually moving things around in the OS (how many times has the freaking control panel been re-vamped over the years? Stop mucking about MS, FFS) requires me to puzzle-solve, instead of getting my work done.
No pervasive reason to upgrade 10, sorry. ESPECIALLY if you an oldish machine. My personal laptop is a 32-bit Toshiba Tecra M5 with 4GB RAM and a 256GB SSD drive. I bought in 2005 IIRC. It runs Win 7 beautifully.
It also runs Linux Mint beautifully (dual boot), which will probably become my home-use OS at some point in the future, as it's getting easier to install applications in Linux (still a bit of a ball ache though, compared to windows) and there's a great range of free software available that does everything your average home user needs and a whole lot more.
I'm still waiting for printer manufacturers to develop printer drivers for Linux!