That must be a recent change on rules because a while back when I was reading these rules they stated that singles had to be born in 2000 or 2001 but now it says between 1999-2001. The male partners can also now be a year older.
I don't know how recent, but it is copied from here:
http://isuprod.blob.core.windows.net/media/177891/2014-22-08-wyog-2016-qs-isu-figure_skating-en.pdf
ETA: the document is dated August 2014.
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