A mate at work reckons that black/metalic black cars are not a such a good idea if you plan to keep the car for 7 or more years. He reckons black cars are more likely to show their age due to marks from cleaning or general age than non black cars. Having never had a black car before I have no terms of reference. Is what he is saying basically true? Do they "age" quicker than your typical silver or some such?