I've been using Macs for quite a while now, but I've never modified one. Basically, when it's time for a new machine, I just get a new one. Recently I bought a 2015 PowerBook Pro to replace my early 2011 PowerBook Pro, but I still have the older machine, and here's my question: Would it be possible to upgrade the early 2011 PowerBook Pro (2GHz core i7) so that it was still adequate for light web browsing in 2 years? I'm wondering if I could stick a few hundred into it and be able to use it as a "vacation laptop" for the next couple of years. It's fine right now, and I'm actually quite attached to it, so I would like to keep it around for as long as I can. Any input would be appreciated.