Nick, I know you're a senior citizen so I will say this. If you are buying a brand new computer, I would ask the seller if they could install Windows 7 on it for you. Most new PC's have Windows 8 installed on them and I'm fairly sure that would drive you nuts.
As has been previously said, this game will run okay on a system that has moderate specifications so you don't have to spend lots of cash on a high end machine. It would also be a good idea to tell the seller what you intend to use your computer for so that they can advise you as to the best machine to fit your requirements.