Willy, age 17 years, eleven months, buys a used car on credit. The contract also includes a service agreement obligating the seller to perform certain maintenance on the car for one year. Willy makes five monthly payments in the five months after he turns 18. In addition, he has the seller service the car on four separate occasions. After making the fifth payment, Willy announces that he wants to disaffirm: i.e., to return the car and get back the full price. Can Willy disaffirm here?