I'm kind of like my car, which has 99,348 miles on it. I can take it to the carwash, but it still has dings in the front fender and a weird stain on the roof liner.
My kid still has the human version of the new car smell, no scars, no imperfections. At that stage of ownership, you don't really believe that your car will get old and start needing repairs , that you'll some day worry about funny noises, that it won't be completely reliable. That one day it will leave you stranded by the side of the road, and you'll just have to hope they can fix it.
Oh, well, I've gotten kind of sanguine about my nicks and scuffs.