#! Heights - don't mind flying - but hate to get near the edge of cliffs or tall buildings on foot or in car. I am ok if I am in the middle of the room, but not at the edge.
#2 Afraid something bad will happen to my kids/wife - I can live with dying, though don't want to, but would have a hard time dealing with death of any of my kids or wife. Hell, my parents, 82 and 88, are still alive.
#3 Driving with bad drivers - absolutely hate to drive with risk takers and speeders.
#4 Impotence - sort of selfish, but I am almost 55 and wife is 29. Have talked to her about it bit. She is far less concerned than I am . (don't know if that is a good thing)
#5 Not having enough money - have lived a life of conspicuous consumption and counting on inheritance for retirement is probably poor planning
#6 Senility - I don't want to be old and feeble. This may be up there closer to #3.
For you younger guys, if you are anything like me, most of this will make no sense to you. I never worried about things like #3-#6 until I hit about 50. When you come to the realization that you are on the downside of your life, it is hard to come to grips with it at times. I have lived a fantastic life and done many things other people could only dream of doing, so I have no regrets. Watching my once strong and virile father deteriorate before me is very, very scary - a portent of things to come. And he is in better condition that the average man of 88.