Emirates plane ticket saying adult instead of child

Hi,
Dk if anyone on here can help me with this, but worth a try!
I'm going on holiday with my family soon, and when i was checking the itinerary/plane ticket details, it said 'adult' instead of 'child' on my little sister's ticket (who is 10).
I thought it was because maybe emirates classed 10 y/o's as adults, but i don't think they do?

Also, even if it says adult, would that still be ok? Like would the airline still permit us to go or no?

Thanks,