When should I change my timing belt?

I have a 2007 Acura TL s type I am the original owner I have
17,145 miles on my car I was told by the dealer that I
should replace my timing belt because my car is old there's
nothing wrong with my car it's running perfectly fine I only
brought it in to get the aux in jack fixed. My car has
Bluetooth but doesn't have Bluetooth streaming media. I
asked if I needed to do anything to my car and they said I
need to have the brake fluid changed and the timing belt
replaced based off of age alone. I can't find any
documentation that says my timing belt needs to be
replaced before 60000 miles. The owner's manual does not
reference time it only says miles I don't want to spend $700
for no reason can anyone shed some light on this??