根据DateTime计算年龄

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime begin = new DateTime(1996, 10, 23);
            DateTime end = new DateTime(2018, 9, 27);
            Console.WriteLine(calculationDate(begin, end));
            Console.ReadKey();
        }

        public static string calculationDate(DateTime beginDateTime, DateTime endDateTime)
        {
            if (beginDateTime > endDateTime)
            {
                return "开始时间应小于或等与结束时间！";
            }

            // 计算出生日期到当前日期总月数
            int Months = endDateTime.Month - beginDateTime.Month + 12 * (endDateTime.Year - beginDateTime.Year);
            // 出生日期加总月数后，如果大于当前日期则减一个月
            int totalMonth = (beginDateTime.AddMonths(Months) > endDateTime) ? Months - 1 : Months;
            // 计算整年
            int fullYear = totalMonth / 12;
            // 计算整月
            int fullMonth = totalMonth % 12;
            // 计算天数
            DateTime changeDate = beginDateTime.AddMonths(totalMonth);
            double days = (endDateTime - changeDate).TotalDays;

            string returnStr = "";
            if(fullYear > 0)
            {
                returnStr += fullYear + "岁";
            }
            if(fullMonth > 0)
            {
                returnStr += fullMonth + "月";
            }
            if (days > 0)
            {
                returnStr += days + "天";
            }
            
            return returnStr;
        }
    }
}