At What Age Would You Let Your Child Dress Up As a Zombie?

Zombie's seem to be everywhere right now. Every dance and cheer team has a zombie routine and all Halloween costumes come in regular form and "zombie" form. I have heard of everything from zombie themed Birthday parties to zombie scholarships for college. Zombie's are defiantly a new trend that has been sweeping the nation for the past year and right now ALL children want to be a zombie for Halloween.