Robertson, while a minor, contracted to borrow money from his father for a college education. his father mortgaged his home and took out loans against his life insurance policies to get some of the money he lent to Robertson, who ultimately graduated from dental school. Two years after Robertson's graduation, his father asked him to begin paying back the amount of $30,000 at $400 per month. Robertson agreed to pay $24,000 at $100 per month. He did this for three years before stopping the payments. His father sued for the balance of the debt. Could Robertson disaffirm the contract?