Board Thread:Questions and Answers/@comment-208.63.90.153-20150920231336/@comment-200.34.188.2-20160204204207

maybe... but just maybe the birth date is "fake" since Venom Snake can look whatever way you want him to, and you can make him look younger or older than Big Boss himself, and the date on the passport was just to make him be around the same age

this is just my take on it of course I'm most likely wrong :P