This program prompts you for the current date
and several birthdates.
It computes the age in years of the youngest
person and wishes Happy Birthday as appropriate.
Minimum allowed age? 5
Current year? 2009
Current month? 4
Current day? 28
Number of people? 3

Birth year? 2009
Birth month? 4
Birth day of month? 28
Happy 0th birthday!

Birth year? 2007
Birth month? 4
Birth day of month? 28
Happy 2nd birthday!

Birth year? 2005
Birth month? 4
Birth day of month? 28
Happy 4th birthday!

The youngest person is age 0
Sorry, you have not all reached your 5th birthday.