I do think that you have a chance because of your interesting background (seven countries? cool!). The good news is that HBS and Stanford have been trying to attract younger applicants over the past several years.
But, it won't be easy to get in. The main question you will have you CONVINCINGLY answer is, "Why do you want an MBA now, and not 3-5 years from now?" If you can do that, you can get in. Otherwise, you'll probably want to wait.
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