People here offer many good explanations, but I would like to offer a very simple one. People always want hope that they have other options. And as you get old

People here offer many good explanations, but I would like to offer a very simple one. People always want hope that they have other options. And as you get older, other options (to learn another job, for instance) diminish. So we get unhappy that we are stuck, and start to hate that situation.