DBirthdays module (mod_dbirthdays) shows nearest birthdays (future or past) of your site users. You can set number of days before and after birth date to show and limit maximum events count. There can be shown user avatar, links to PMS and profile.
The module can be flexible configured to works with different (users management) extensions (Community Builder, JomSocial, forums etc).
Note: DBirthdays is only module to show birthdays. You must use any extension (component) for users data.