you could try something like this in a control rule

<%

ClipboardPage cpParentPage = tools.getActive().getParentPage();

int age = cpParentPage.getString(".AGE");

String result;

if (age > 50) {

        result = "red";

    } else {

        result = "green";    }

tools.putParamValue("result" , result);

%>

<pega:choose>

<pega:when test='param.result=="red"'>

  <div style="background:red;font-weight:bold">

          add your test here

  </div>

</pega:when>

<pega:when test='param.result=="green"'>

  <div style="background:red;font-weight:bold">

          add your test here

  </div>

</pega:when>

<pega:otherwise/>

</pega:choose>