date of birth to age

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

       

        private void button1_Click(object sender, EventArgs e)
        {
            int intYear, intMonth, intDaY;
            intYear = Convert.ToInt32(textBox1.Text);
            intMonth = Convert.ToInt32(textBox2.Text);
            intDaY = Convert.ToInt32(textBox3.Text);
            DateTime dtt = new DateTime(intYear, intMonth, intDaY);
            DateTime td = DateTime.Now;
            int Leap_Year = 0;
            for (int i = dtt.Year; i < td.Year; i++)
            {
                if (DateTime.IsLeapYear(i))
                {
                    ++Leap_Year;
                }
            }
            TimeSpan timespan = td.Subtract(dtt);
            intDaY = timespan.Days - Leap_Year;
            int intResult = 0;
            intYear = Math.DivRem(intDaY, 365, out intResult);
            intMonth = Math.DivRem(intResult, 30, out intResult);
            intDaY = intResult;
            MessageBox.Show("Hello dear! You are " + intYear.ToString() + " Year/s " + intMonth + " Month/s " + intDaY + " Day/s");
       
        }
    }
}