title: Calculate ages in R
body: <p>I have two data frames in R. One frame has a persons year of birth:</p>
  
  <pre><code>YEAR
  /1931
  /1924
  </code></pre>
  
  <p>and then another column shows a more recent time.</p>
  
  <pre><code>RECENT
  09/08/2005
  11/08/2005
  </code></pre>
  
  <p>What I want to do is subtract the years so that I can calculate their age in number of years, however I am not sure how to approach this. Any help please?</p>