Rocky, a 17-year-old, recently purchased a new sports car from a local dealer. He is planning to use the car for car racing. As a part of the sales contract, the dealer agreed that Rocky could have free scheduled servicing for three years. Rocky recently attempted to book in the car for its first scheduled service but the dealer said he would not service the car because Rocky is under the age of 18 years and the contract is, therefore "null and void" - so the dealer has no obligation to service the car, and Rocky cannot sue him for damages if he refuses to carry out the service.

Advise Rocky as to why he can or cannot enforce the dealer's promise. Support your advice with relevant legal reasons and one precedent