Calculate Age

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public int getAge (int _year, int _month, int _day) {
		
		GregorianCalendar cal = new GregorianCalendar();
		int y, m, d, a;		

		y = cal.get(Calendar.YEAR);
		m = cal.get(Calendar.MONTH);
		d = cal.get(Calendar.DAY_OF_MONTH);
		cal.set(_year, _month, _day);
		a = y - cal.get(Calendar.YEAR);
		if ((m < cal.get(Calendar.MONTH))
				|| ((m == cal.get(Calendar.MONTH)) && (d < cal
						.get(Calendar.DAY_OF_MONTH)))) {
			--a;
		}
		if(a < 0)
			throw new IllegalArgumentException("Age < 0");
		return a;
	}