Usally a good ruel of thumb is 90k miles. The way i would check is look at the waterpump from behind the block. there is a little peice of it sticking out. If the aluminum is shinnier than the block then chances are the t-belt was replaced with it. Also look at the drive belts. They should say honda on them if they are original. But they still may have been changed but not the t-belt so thats not a solid sign