public static void Main(string[] args)
{
var result = "";
var day = 0;
var now = DateTime.Now;
ListClass list = new ListClass();
foreach (var item in list.InitialPersonList())
{
day = day + Math.Abs(((TimeSpan)(now - item.Birthday)).Days);
}
var avgday = day / list.InitialPersonList().Count;
var avgYears = avgday / 365;
var avgDays = avgday - avgYears * 365;
result = "平均年龄：" + avgYears + "周岁" + "-" + avgDays + "天";
Console.WriteLine(result);
GetName(list.InitialPersonList());
}