Scientists accidentally kill world's oldest animal at age 507. The oldest animal ever known lived from 1499 until the day researchers cracked its shell open, killing it in the process.
For example, there is a federal law (and similar laws in every state) allowing consumers to cancel contracts made with a door-to-door salesperson within three days of signing. You might use that law after hastily agreeing to have someone repave your driveway, deliver lawn fertilizer, or put a new roof on your house.
A minor generally cannot form an enforceable contract. A contract entered into by a minor may be canceled by the minor or their guardian. After reaching the age of majority (18 in most states), a person still has a reasonable period of time to cancel a contract entered into as a minor.