A budding developer over at xda-devs has just release a new application. This Manila Birthday will display a list like view of all your Contacts, birthdates and ages.
The Application has two display options:-
One will tell you how many days until your Contacts' Birthdays and sort them earliest first.
The second one is an alphabetical list of your Contacts showing their age and birthdays.
In either view, tapping a Contact will open up that Contact on your Device. It uses Sense/Manila Graphics as its built on Manila SDK.
Download it here