As an old man too, I concur with your comments. However, we must expand our thinking and think of our loved ones. For example: I was discussing MARS ONE with my wife and I said, "we are too old to apply. But, our grandchildren will have this option."
Things on earth are really bad and will get worse. And, like top scientist say, "there is a chance of a huge meteor to hit earth again. It is not a question of IF but of WHEN." For the human race to survive, we must start relocating. Hence, MARS comes into mind.
Have a nice day.