It's worse than major, it's a serious offence (100% surcharge). I couldn't find the information on an official website, but the following document seems pretty comprehensive. See page 14, bottom right.
http://f1.cdpwebsolutions.com/faq.pdf
I think the insurance implications may be worse than the suspension.
EDIT: The above applies if you have a G1/G2/M1/M2. If you got the ticket strictly based on being 21 or less, I would assume the same consequences, but that is just a guess, I couldn't find any useful information.
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