A good place to start on a project like this is Opposing Viewpoints in Context. You can start with those ideas of "genetic engineering" (or "modification") and ''extend life" as search terms in the box at the top of the page or browse for topics in the categories that appear on the front page of the database. We have a guide that will list other good starting places.
Please call if you are still having trouble getting started. Reference Desk: 508-854-4366