Hi @ricardobortolaci,
You could use BP Birthday Greetings to bring this feature to your website as it is supported by our theme:
BP Birthday Greetings
It will allow you to send a birthday greeting notification to members and display the list of member birthdays. BP Birthday Greetings will base itself on the extended profile field of your choice to greet your members on their birthday.
However, please note that this plugin does not support The Events Calendar. In consequence, no birthdays will be displayed to the website agenda.
Finally, we’re not sure if it’s possible to create a new page containing members that will specifically celebrate their birthdays within the 30 days. To be sure, it’s best if you try to reach the plugin authors and ask them directly:
https://wordpress.org/support/plugin/bp-birthday-greetings/
Best,