Hyphenation

["Global SchoolNet Fdn (FrEdMail)" <lmnet-l@ACME.FRED.ORG>]

This may sound like a strange question, but I have asked several English
teachers and can not get a definative answer.

  How to you hyphenate "Sixteen year old"
    I have seen
            Sixteen-year-old
            Sixteen-year old
            Sixteen year-old.
This type phrase appears in notes for books frequently.  I have started
using "sixteen year-old" just because it looks correct.  Does anyone really
know?

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