at what mileage should a timing belt replaced. It has 80000 miles on it.

What is your question?

I purchased the car from the original owner and it was very well taken care of. It's a fully loaded Limited Edition. I had my mechanic check everything and he says it's in great condition. He told me to find out if the belt has ever been replaced as a preventative measure, as of now there are no problems or symptoms pertaining to the timing belt. I thought he only asked me about that because maybe these cars are known to having problems with the timing belt once they hit a certain amount of miles.