Re: Rear end damage
i had a ford taurus that was rear ended at about 40-45km/h. only rear bumper damage, replaced, good as new. few months down the road, weird noises from all over the car while going over bumps or potholes and i was never able to get both rear tires to wear at the same pace again.
now, every incident is different, however, an impact like yours it is very likely to weaken the frames and all the nuts and bolts.
just because you don't see the damage doesn't mean it is not there. these frames are designed to absorb the shock, not to withstand heavy hits and look pretty. of course the car can still be on the road for the next 5 years, but it will NEVER freaking be the same as a car with no accident.