Explanation:
First of all, the dealer should not have sold the car to the sixteen year old boy without the presence of his parents or any guardian. It is illegal to have a contract with a child who is not legally allowed to drive the car before the age of eighteen.
Now secondly if the dealer has somehow sold the car to the boy, the boy cannot come back after few months and ask for returning his money because he purchased the car, the condition of the condition of the car got worse during the whole time when car was with him, and also there is no legal clause in the agreement which allows him to demand his money back after using the car for this long time. So demanding his money back from the dealer is totally unethical as well as illegal. The dealer is true that the car is still the property of the boy and the money is still the dealer's money.