[ladyinred]

I have a iMac, but it is about 3 years old. Since I am not computer savvy, is there anyway I can buy an OS for mine? I am asking I suppose, if it will run in an older mac?

[Freemeorkillme]

I'd think os, but here the system requirements facts:

http://www.apple.com/macosx/upgrade/requirements.html

You're probably safe, but check to be sure.

[Swordmaker]

I have a iMac, but it is about 3 years old. Since I am not computer savvy, is there anyway I can buy an OS for mine? I am asking I suppose, if it will run in an older mac?

It will run fine. You SHOULD have some more memory than the 32 Megs the first iMacs were released with, however. But memory is cheap.