From Tom Margenau:
About 40 years ago, a national organization conducted a poll of people in their 20s and asked them this question: “In the future, do you think you are more likely to see a Martian or to see a Social Security check?”
It may not surprise you to learn that a vast majority of the respondents picked the Martian. Young people back in the 1970s thought it was more likely that they would encounter little green men from outer space than a little green government check with their name on it.
Well guess what? Those folks (who are still alive) are now all in their 60s. Not a one of them has ever seen a Martian, but almost all of them see a little green government check each month. (Well, they see a notice from their bank indicating that a Social Security check has been deposited into their account.)