I have a 2000 Honda Civic with 140,000 miles on it. Do you think the timing belt has been changed?

I read somewhere that they are supposed to be changed at 105,000 miles, or seven years. My car has a lot more miles than that, and twice the age. Do you think the belt has been changed before? Or is it possible it's the original belt? Would the original have lasted this long?

Read more: I have a 2000 Honda Civic with 140,000 miles on it. Do you think the timing belt has been changed?