title: jquery calculating age based on dob
body: <p>I have a <code>textfield</code> where the user enters the date of birth in <code>mm/dd/yyyy</code> format.  I want to autofill the <code>age</code> field for the user based on their entered dob.</p>
  
  <p>the age <code>textfield</code> should be populated when user tabs out of the dob field.  </p>
  
  <p>what is the jQuery way of doing this?</p>