I bought my Macbook Pro in December 2008. I'm running Snow Leopard and want to upgrade to Mountain Lion but I'm not sure I have the requirements that are needed. Can you look at these and tell me if I can upgrade?
If I'm not mistaken that is because in Snow Leopard you can boot into 32 bit or 64 bit mode, with 32 bit being the default. It looks like you are simply booted into 32 bit mode.