title: Modify a single observation in a SAS data set
body: <p>Suppose I have the following data set:</p>
  
  <pre><code>data people;
      input name $ age;
      datalines;
  Timothy 25
  Mark 30
  Matt 29
  ;
  run;
  </code></pre>
  
  <p>How can I change the age of a particular person? Basically, I want to know how to specify a <code>name</code> and tell SAS to change that person's (observation's) <code>age</code> value.</p>