Contracts signed by minors, those under the age of 18, do not have the same legal status as contracts signed by adults because minors are seen as not having the same legal understanding as adults. Because of that, when minors sign contracts, the contract is not valid, and minors are under no obligation to honor that contract. There are exceptions, which include contracts for food, lodging, medicine, and other necessities.
Outside of contracts for necessities, minors may enter into a legal agreement, but the contract is considered "voidable" only by them. This is due to the presumption that minors lack the legal capacity to initially agree to the contract terms. A minor may choose to either terminate the agreement or allow it to continue as agreed upon. The law surrounding minors' ability to enter contracts is meant to prevent them from agreeing to a contract that takes advantage of their lack of understanding.
Minors can only void a contract due to their age while they are still considered a minor. Once a person reaches the age of 18 and hasn't taken action to void the contract, they can no longer void it for that reason.
How a Minor Can Void a Contract
A contract can be voided by a minor in one of two ways:
File a lawsuit requesting the court to void the agreement.
If sued, increase the affirmative defense of lack of capacity.
The entire contract must be voided if a minor chooses to void any part of it. It is not possible to void only one provision of the agreement. The minor cannot simply pick and choose the terms of the agreement that sound favorable.