You are not eligible to create an Apple ID at this time?

It's finally my 15th birthday and my parents got me an iPhone 6 (yay). I'm trying to create an Apple ID so that I can start downloading stuff from the App Store. I typed in all the details and checked (and double checked) but the message kept showing up. Could anyone please help me? [I don't know which category this fits in… So if I'm wrong… Sorry]

Use your perrents B day. You're too young.