91 accord

I"ve got a 1991 Honda Accord with 85,000 miles on it.
It had its timimg belt replaced when it was 7 years old (1998), but it
only had 40,000 miles on it at that time.
Now, 8 years later (2006), the replaced timing belt only has 45,000 on
it.
My Question is - should I get the timing belt replaced - due to it
being 8 years old (with only 45,000 miles on it).
or could I wait until the belt has more miles on it.
Currently the car gets regular use, about 12,000-15,000 miles a year.

Thanks for any advice.