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This page tells you how many days old you are and on which day you were born.
The number of leap days tells you how many February 29's you've experienced. For instance, someone born in August 2016 will have 0 leap days because he was born after February 29th.
The year 2000 is a leap year. Year numbers divisible by 100 aren't leap years, unless they can be divided by 400.