I don't know but he's at least 40. His augmentation makes him seem probably about 25-30 years old.
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In Halo 3, you play as the Master Chief, the last surviving super-soldier of the Spartan II group. In Halo 3: ODST, you play as an ODST instead of the Master Chief. There are also different weapons in ODST.
Master Chief is a male.
it is a rank in the spartan army and John (master chief) is not only the last spartan but he is also the only master chief
master chief is totaly NOT A GIRL.OfcnStupid person
Master Chief is a Master Chief in the UNSC (A fictional branch of the military) and is the highest enlisted rank attainable.