asp.net根据生日计算年龄（具体到年月天）

    private string getAge(string bornDate)
    {
        DateTime b = DateTime.Parse(bornDate);
        int a2 = DateTime.Now.Year;
        int b2 = b.Year;
        int a3 = DateTime.Now.Month;
        int b3 = b.Month;
        int a4 = DateTime.Now.Day;
        int b4 = b.Day;
        int aa = (a2 - 1900) * 365 + a3 * 30 + a4;
        int bb = (b2 - 1900) * 365 + b3 * 30 + b4;
        int cc = aa - bb; //天数
        int dd = (int)Math.Floor(Convert.ToDouble(cc / 365));
        int days = cc - dd * 365;
        int ee = days / 30;
        int day = days - ee * 30;
        return dd.ToString() + "岁   零" + ee.ToString() + "个月    零"+day+"天";
    }