Showing the day and month, but no age, doesn't make any sense at all and showing the age and being forced to show the entire birthday doesn't make sense either. Most people don't mind sharing their age with strangers or people they hardly know, but birthdays are usually private information, especially online.
Basically, it needs to function backwards, "Show age?", then "Show day and month?", that way, if someone wants to keep their birthday private, they can, and if someone wants to show their birthday, they can and if another user wants to work out the year, they can. I don't think showing the year is necessary as it is, because if you're showing your age and then being forced to show the whole dd/mm/yyyy, the year isn't needed anyway because you're already showing your age.
Is there a way to make this function with age first, then day/month optional?
Thanks dudes and dudettes