Calculate # of Years Alive in C# WinForm

This question already has an answer here:

How do I calculate someone's age in C#? 64 answers

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Try something like this:

private void button1_Click(object sender, EventArgs e)
{
    DateTime  sonsBirthday = DateTime.Parse(txtSonsBirthday.Text).Date;

    DateTime now =  DateTime.Now;

    TimeSpan timeSpan = now - sonsBirthday;
    //timeSpan = Convert.TimeSpan(lblTimeAlive); // old
    lblTimeAlive.Text = timeSpan.ToString(); // new

Then fine tune the string formatting for timeSpan .

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