William E. Story agreed orally with his nephew that if he would refrain from drinking liquor, using tobacco, swearing, and playing cards or billiards for money until he became twenty-one years old, then he, Story, would pay his nephew $5,000 when the nephew reached age twenty-one. The nephew fully performed his part of the agreement. But when the nephew reached age twenty-one, his uncle stated that he had earned the $5,000 and that he would keep it at interest for his nephew. Twelve years later, Story died, and his nephew brought an action to recover the $5,000 plus interest. Was there sufficient consideration to create a contract?