Is 90,000 miles on a 1999 Pontiac firebird ok for a used car?

I am planning on buying a used 1999 Pontiac Firebird. The car rides good but the only thing that bothers me is that it already has 90,000 miles on it. On an average maintained firebird, is 90,000 mies close to the end of problem free running? Also 5000$ (inclding dealer fee, tax and everything else) a good price?