One thing I don't specialize in is being over seventeen years old. This would be bad for things like exchanges. Who wants a teenager dealing with their money? (I probably wouldn't want to develop an exchange anyways, as there are many already available.)
Probably a prudent attitude, but you may be interested to know that the founder of bitcoinica, Zhoutong, was approximately 17 years old when founded it three months or so ago. Never say never.
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