This may work for you:

protected void Button1_Click(object sender, EventArgs e)
    {
        DateTime Birth = new DateTime(1954, 7, 30);
        DateTime Today = DateTime.Now;


        TimeSpan Span = Today - Birth;


        DateTime Age = DateTime.MinValue + Span;


        // note: MinValue is 1/1/1 so we have to subtract...
        int Years = Age.Year - 1;
        int Months = Age.Month - 1;
        int Days = Age.Day - 1;
        Response.Write(Years.ToString() + " Years, " + Months.ToString() + " Months, " + Days.ToString() + " Days<br />");
    }