int Age(Date date1, Date date2) {
	Date date_t;
	if (date1 > date2) {
		date_t = date2;
		date2 = date1;
		date1 = date_t;
	}
	if (date2.month > date1.month) return date2.year - date1.year;
	else if  (date2.month < date1.month) return date2.year - date1.year - 1;
	else if  (date2.month == date1.month) {
		if (date2.day >= date1.day) return date2.year - date1.year;
		else if  (date2.day < date1.day) return date2.year - date1.year - 1;
	}
	return -1;
}

int AgeYears(Date date1, Date date2) {
	int sign=1;
	if (date1 > date2) sign = -1;
	int age_years = sign*(date2.year - date1.year);
	int month_dif = sign*(date2.month - date1.month)
	if ((month_dif < 0)||((month_dif == 0)&&(sign*(date2.day - date1.day) < 0))) age_years--;
	return age_years;
}