I once asked my T whether "normal" people thought about death and she replied that if someone came in and told her they pondered it twice a year she wouldn't be concerned. However, suicidal thoughts occur to me almost 24/7 and only differs in intensity (sometimes they fade in the BG while other times they compel me), which is abnormal to her. She says that most people think about death now and then and that is absolutely normal but it's a different ballgame to actually plan and act on them.