title: Calculating Age in Months and days
body: <pre><code>function getAge(dateString) {
      var today = new Date();
      var birthDate = new Date(dateString);
      var age = today.getFullYear() - birthDate.getFullYear();
      var m = today.getMonth() - birthDate.getMonth();
      if (m &lt; 0 || (m === 0 &amp;&amp; today.getDate() &lt; birthDate.getDate())) {
          age--;
      }
      document.write(age);
  
  }
  
  getAge("01/20/2011")
  </code></pre>
  
  <p>This shows me 0 years, but i would like to show <code>10 Months</code> and 9 Months until he his birthday comes <code>10/20/2011</code>. </p>