Unexpected token 'void'

Hi , 

 I has the same issue but i found that i has a missing class OlderAccountsUtility. So i fixed it and the correct way is:  

public class OlderAccountsUtility { 
    public static void updateOlderAccounts() { 
      // Get the 5 oldest accounts 
      Account[] oldAccounts = [SELECT Id, Description FROM Account ORDER BY CreatedDate ASC LIMIT 5]; 
      // loop through them and update the Description field 
      for (Account acct : oldAccounts) { 
          acct.Description = 'Heritage Account'; 
      } 
      // save the change you made 
      update oldAccounts; 
    } 
}