/**
  * Calculate the number of Years till Retirment
  * @param client $id
  */
 public function getYearsTilRetirment($id)
 {
     $this->checkAcl('read');
     //Get Current Year
     $currentYear = null;
     $date = new DateTime();
     $currentYear = $date->format('Y');
     //Get Client Retirement year from Employment data
     $clientEmploymentGateway = new Clients_Model_ClientEmploymentGateway();
     $retiementYear = $clientEmploymentGateway->fetchClientRetirementYear($id);
     $retYear = DateTime::createFromFormat('Y', $retiementYear['client_employment_retirementyear']);
     if ($retYear >= $currentYear) {
         $yearsTilRet = $date->diff($retYear);
         return $yearsTilRet->y;
     } else {
         return null;
     }
 }