Mom had to roll across the internation dateline somewhere in there ... and New Years eve needs to play a part ... like if the older twin were born on 12/30 near midnight, then mom's hospital gurney, which is set right on the international date line, rolls over it, and just past midnight the "next" day, the younger twin could be born on 1/1 ... AND the younger twin's birthday would be earlier in the year than the older twin's.
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