Checker age +18 with possibility to register a parent

Hi,

i need to calculate age from birthday field, displaying age in registration form, and if the user are more than 18 years i can allow to proceed, but if he arent, i must allow him to his parent to give his document number (example license driver or id) to register for the son.

To calculate age i tried to use CB Code Field plugin to calculate age and display it, but i could not do it, so i would need of some help. I read the tutorial but is not clear for me this:https://www.joomlapolis.com/documentation/18534-calculating-years-months-days-from-birthday-field-using-cb-code-field

To allow parent to give his personal data, i need to open a new field if age is less than 18, in which parent can digit his license driver. I think that i can do this with CB Conditional plugin, but i need help in this case too.

Can you give me support?

If you can develope this feature for me i can pay your job, because i dont know if i can do it by myself.

Thank you in advance
Nicola

Use a date field and set its display mode to Age then for its validation specify the year range. There is no exact age validation rule, but have added a feature ticket to explore adding that. Current validation is year range only which in some cases can allow someone to select an age -1 or +1 for the range you're wanting (e.g. 17 instead of 18) since it's only limiting the year selection and not month and day.

forge.joomlapolis.com/issues/7249