Facebook app - custom fields during registration

Hello,

I have one question about when user Sign in with facebook account (attachment "0".
Then - for example you dont have account on my site - you click Create my account (attacjment "1"
On backend I had setting that we have way "Normal registration" during registration with FB. So.. then the next step in Choose profile type (attachment "2"
FIRST QUESTION: is here possible that we can skip this step (because we have just one profile type - Registered users) ?

Then next step is complete or check data (here I - for this mail sending picture - delete filled data).
SECOND QUESTION: is here possible that I as admin add some our custom field? For example if I want that in our site you must be at least 16 years old. With normal registration this I can achieve - custom field Birthday. With sign in with FB this field (birthday) is not there and... on the other hand.. this data (birthday) is not transferred from FB.... just Name, Surname, Male.
Is this possible? Or, it is maybe some different way to achieve this?

Best regards