Option to show or hide birthday during age-restricted registration

[moonclamp]

I've modified my register.php to disallow registrations from anyone under 18.

Anyway, when registering on an age restricted forum you get a date of birth prompt before being taken to the profile/settings page - but in this mode there are no options for displaying/hiding the date of birth on a profile ... this only appears on the non-restricted registration forms.

I'm after something that forces a user to submit a date of birth, but on page 2 have the option to hide/ show it on their profile (minus the ability to edit the date).

Can anyone work this one out for me please?

Thank you