Contributing a birthdate or birthdate correction to someone else’s page will require the inclusion of supporting evidence. Acceptable evidence can be found in the following link:
There are instances where personal details, like age, may not appear on a name page or be open to public contribution.
For example, if a page is claimed and the owner has either self-verified their birthdate or chose not to display it, contributions to add or update the Birthdate will not be allowed.
When contribution is not available based on the page owner’s selections, you’ll see a message in the workflow and won’t be able to submit that data to the page. In this case, you'll need to Contact Us to request any changes.