Edited after the first two responses:
What I'm looking for is the age at which a normal, healthy child should no longer have a baby monitor turned on in his/her bedroom. If never is a choice, feel free to leave a comment. I'll tally those by hand, later.
Upon further reflection, the question I want answered is "By what age should a baby monitor be removed from a child's room because if it isn't I will think the parent is a nut."
I am a parent and I think parents should use a baby monitor until:
I am not a parent, however I think parents should use a baby monitor until: