Modifying this control will update this page automatically

Show contacts’ birthdays in Calendar on Mac
When you add birthdays to contact cards, you can see the birthdays on the Birthdays calendar in the Calendar app—just make sure Calendar settings are set to show the Birthdays calendar.
Go to the Calendar app
on your Mac.
Choose Calendar > Settings.
Click General, then select “Show Birthdays calendar.”
The Birthdays calendar is updated automatically when you add or remove birthdays in Contacts.