workaround so that recruiter needs to fill dob field while creating candidate profile

Summary:

Content (please ensure you mask any confidential information):

Hi,

I understand in candidate creation page we cant create any additional fields , however what can be the workaround ? such that when a recruiter or hr creates a candidate profile the fileld dob should be filled ? How can make sure they fill that ?

Version (include the version you are using, if applicable):

24c

Code Snippet (add any code snippets that support your topic, if applicable):