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Hi @shellb81 there are two separate issues here. One is that people enter a date, but find the continue button is greyed out and the other issue is like yours were an date has been entered that makes the player too young to play Candy Crush. In the first instance the DOB screen doesn't disappear as it just gets greyed out. In your case the DOB screen disappears because you have successfully entered a date.
All you can do to resolve your issue is to contact King using the CONTACT US button shown in your screenshot, and explain what happened.