William Story promised his nephew that he would pay the nephew $5,000 if he gave up "using tobacco, swearing, and playing cards and billiards until he was 21." The nephew did so and asked his uncle for the money. His uncle agreed to pay but died before he did so. The uncle's estate refused to pay, arguing that there was no consideration for the uncle's promise. Should the court uphold the agreement in this case? Why or why not?