Is 121,000 miles good for a ford mustang that was made in 2006?

I'm looking for a used car and was wondering if this is decent just to get me from university and back (home) i live around an hour away.

That's about average. About 14,000 miles a year.

Still, any car with 121,000 miles on it ought to be checked out pretty carefully.

It's not bad, miles can be deceiving when it comes to vehicles 121k highway miles are a lot less hard on the car than 121k of city driving on the car.