at what mileage should the timing belt be replaced on 1998 Lexus GS300

I have 100,000 miles have not replaced timing belt is it time?

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2 answers
RepairPal shows the timing belt for this car being recommended at 90K: http://repairpal.com/handler/KvmlqPfvG5pR7qqgcVnn

Highly recommended to have that service performed immediately. If you throw a timing belt, you run a risk of doing serious engine damage.
My mechanic keeps telling me I am tempting fate but my 2001 Lexus has 152000 miles and the original timing belt and water pump