How to fetch Google logged in user birthday and gender objective c?

Question

How can we get google logged in user age and genger in objective c. I make that user's profile information public. code:

NSString *userId = user.userID;                  // For client-side use only!
NSString *idToken = user.authentication.idToken; // Safe to send to the server
NSString *fullName = user.profile.name;
NSString *givenName = user.profile.givenName;
NSString *familyName = user.profile.familyName;
NSString *email = user.profile.email;

I checked below links but not find any solution.

https://developers.google.com/+/web/api/rest/latest/people/get

Retrieving date of birth and marital status with Google OAuth API