yes!
you have to be 15 and older to compete in table tennis in the Olympics
12, he is the youngest athlete to compete in olympics history.
You must be 16 or turning 16 the year of Olympics to compete in them.
no women were not aloud to compete in the Olympics.
Yes, you can compete in consecutive Olympic games.
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BMX
bmx i think
You must turn 15 years old by the time the Olympics start, I believe. You must be invited by your nation to compete, and meet all qualifying standards for the event. You must be the age of eligibility for the sport either during the trials to determine the teams, or December 31st of the year of the Olympics, you'd have to find out from the international federation for the sport in question.
No, not in the modern Olympics - in the Anciemnt Olypics, you had to be a Greel male (and thus believe in the Greek Gods of old).
jesse owen compete in the olympics in 1936 23rd of april