There is no prove about her age being false even if there is a lot of discussion going on about it.......
I have seen this routine live, and even if there still might be some issues with it it was awesome!!!
Yes, that girls is small, and she looks young - but some others do so too. So maybe she is younger than her birth certificate indicates - maybe not.
LOL she still is quite about the same size as Ljudmilla Grebenkova though who is married and in her mid 20s.