I bet you can use your Win7 laptop as long as you like it's performance.
I stayed with XP for loooong after it fell out of support, with zero issues.

You could also upgrade your laptop to 10, I have done this with several older machines and all of them ran just as good as they ever did. I do not know about the availability of "aftermarket" win 10 licenses in North America but here in Europe you can purchase keys from 5-10 $. It's a grey market but worked for me every time.