Is it possible for me to change the OS version on these two phones? (VZW S4 Mini and S7 Edge)

I’ve got a couple of old phones that I’ve had for a few years, and while both of them are in great physical condition, both of them run very slowly. So slowly that it’s difficult to really use them for anything; even the home screens tend to be sluggish. My suspicion is that it’s some planned obsolescence thing where...