How to make a simple Age calculator in c#

How to make a simple Age calculator in c#

Code

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace Age_Calculator

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            DateTime dateOfBirth;

            DateTime.TryParse(maskedTextBox1.Text, out dateOfBirth);

            DateTime currentDate = DateTime.Now;

            TimeSpan difference = currentDate.Subtract(dateOfBirth);

            DateTime age = DateTime.MinValue + difference;

            int ageInYears = age.Year - 1;

            int ageInMonths = age.Month - 1;

            int ageInDays = age.Day - 1;

            textBox1.Text = (ageInYears).ToString();

            textBox2.Text = (ageInMonths).ToString();

            textBox3.Text = (ageInDays).ToString();

        }

        private void button1_MouseHover(object sender, EventArgs e)

        {

            toolTip1.SetToolTip(this.button1, "Enter to Calculate Your Age");

        }

        private void maskedTextBox1_MouseHover(object sender, EventArgs e)

        {

            toolTip1.SetToolTip(this.maskedTextBox1, "Enter your Birth Date");

        }

        private void button2_Click(object sender, EventArgs e)

        {

                Application.Exit();

        }

        private void button2_MouseHover(object sender, EventArgs e)

        {

            toolTip1.SetToolTip(this.button2, "Exit");

        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)

        {

            DialogResult result;

            result = MessageBox.Show("Do you realy want to close", "Confirmation", MessageBoxButtons.YesNo);

            if (result == DialogResult.No)

            {

                e.Cancel = true;

            }

        }

        private void Form1_Load(object sender, EventArgs e)

        {

        }

    }

}