MacBook dying + Problem

Having a few issues with my 2010 macbook pro thought i'd share for advice.

So if i'm running multiple tabs in browser say youtube and a few web sites laptop goes right into 70°c and spins over 4000-5000rpm - both can get higher though. Runs hot and loud, getting quite annoying. Pretty difficult to watch netflix or even just youtube sometimes now..

Secondly my problem is youtube itself, lately for whatever reason if I am running a video in tab its fine however soon as I watch tab to look at something else but still listening the audio starts to break up and lag - bare in mind the video is already buffered so its not loading anymore - flash it up to date?

Does it just sound like my macbook has seen better days and its time to upgrade?