I have 96K miles and when i was at 90K thinking of doing timing belt i looked at older posts and decided to hold the timing belt and water pump work till 125K or even a little longer.
All the previous post suggested that no one at least on this forum has seen any damage to the timing belt till 140-150K. And when they got it changed at 90K it was as good as new.
Mine looked as good as new at 87k too. BUT, please remember that the strength of the belt comes from the internal reinforcing cords which you can not see. I have read some technical stuff on TB failures which says the appearance of the exterior rubber has nothing to do with the remaining life. Also, our engines are interference or at least there is a probability that they are. Finally, time is very important too. I wouldn't go much longer than 6yrs/90k. Chances are pretty good that you will only be doing one TB change on this vehicle so why wait?