Of age or not of age?

In today's society when a person of 17 commits a crime there is always a debate over whether or not that person is considered an adult.

Well when all else fails in the legal system consult a 3 3/4 year old. According to her you are a baby until about 5 months, then you are a child until 3 and then you are a kid until you are 101. Yep that's right I am a kid, and so are you ;).

I wonder how that would work in the real world?