Calculate the age from birth date

BirthAge.java

    /**
     * Calculate the age from birth date
     * @param 	birth	the birth date
     * @return			the age
     */
    public static int getAge(Calendar birth) {
		Calendar today = Calendar.getInstance();
		int age = today.get(Calendar.YEAR) - birth.get(GregorianCalendar.YEAR);
		if (
				today.get(Calendar.MONTH) < birth.get(GregorianCalendar.MONTH) ||
				(
						today.get(Calendar.MONTH) == birth.get(GregorianCalendar.MONTH) &&
						today.get(Calendar.DAY_OF_MONTH) < birth.get(GregorianCalendar.DAY_OF_MONTH)
				)
			) {
			age--;
		}

		return age;
    }