how do i set up an i tunes account for my 11 year old?

I am trying to set an iTunes account up for my 11 year old daughter, and I get as far as entering her birth year, but then when I enter 2001 and click next I get a dialogue box telling me that this doesn't meet the Apple age restrictions. I've tried putting 1990 in as well and get the same result. Very, very frustrating!!!!