How to get a minecraft server for an older version like 1.7.10?

I want to run a 1.7.10 server for some mods. You see want to play with my little cousin on a server and i'm aware that we both need the mods, but i just keep on finding 1.8 servers, help

If you already know how to setup a server then i would check here https://mcversions.net/ and find the version you want and click "Server jar" and this should give you all you need. If you don't already know how to setup a server (Which i'm assuming you do) Then just look up how to port forward or use hamachi if you can't for some reason. Shouldn't be too hard. If I've managed to do it, I'm sure you can too.