Birthday calculator

age.py

from datetime import date


class Birthday(object):

    def __init__(self, year, month, day):

        self.dob = date(year, month, day)

    @property
    def age(self):

        today = date.today()

        if self.dob.month > today.month:
            return (today.year - self.dob.year) - 1
        elif self.dob.month == today.month:
            if self.dob.day > today.day:
                return (today.year - self.dob.year) - 1
            else:
                return today.year - self.dob.year
        else:
            return today.year - self.dob.year