title: Return integer value of age(date) function in Postgres
body: <p>I would like to determine the number of days that an account has been open.
  Ideally, I would like to compare the return value to an integer(days).
  i.e </p>
  
  <p>I would like to see if age(open_date) > 14</p>
  
  <p>If anyone has any better ideas... </p>
  
  <p>Thanks</p>