no i dont think so, i think you need to be 21 when you arrive in the country (thou some people have got it a few months b4 they are 21 or the embassy could keep the visa app on hold til you are both 21.
there was a court case recently challenging the rise to 21yrs old, the judgement should be announced in a few weeks, so you might be in luck, it could go back to being 18yrs old.
