[hristov]

Or you can just install Linux. Probably not as pretty as OSX, but fast as hell.

After running Linux for more than 5 years now, I have never felt my system "age." I.e., it may become slower than newer computers but it never becomes slower than it used to be.

Of course I do kernel updates from time to time, but those keep all my local data and applications in place, so they are not like reinstalling the OS for Windows or OSX.