Final answer:
Minors have a reasonable time after they turn 18, the age of majority in most jurisdictions in the United States, to disaffirm a contract. This period is not precisely defined but should be done promptly after reaching adulthood to protect minors from contracts they might not understand fully.
Step-by-step explanation:
Courts allow a minor a certain amount of time to disaffirm a contract when he turns 18 years of age. That time period is typically a reasonable time after reaching the age of majority. The period is not universally fixed and can depend on the jurisdiction, but it is generally expected that a decision to disaffirm should be made promptly upon attaining adulthood. In the United States, the age of majority is 18 for most purposes, such as voting and military service; however, it can vary for other matters like alcohol consumption. Disaffirming a contract essentially means that the minor is exercising their right to void the agreement they entered into before they were legally an adult. This provision is in place to protect minors from being bound by contracts that they may not have been fully equipped to understand or negotiate.