Also, if someone else was as fault (a third party insurance claim) then you may be entitled to file a "Diminished Value" claim against the other party's insurance company for the depreciation caused by this accident.
You cannot however, sue your own insurance company for Diminished Value, so if you banged up your own car, then no-go on that idea.
The older a car is, the less the effect damage will have on value--but as Steve says, there will be a loss of value if the accident is on record. Sometimes it never appears, sometimes it will appear years later. CARFAX is rather erratic and unpredictable.
Of course, if someone asks if your car was in an accident, you should tell them. If the car hasn't been fixed yet, you might take photos of the damage to assure people that the car wasn't a catastophe when hit.