The survey for the Department of Health's Know Your Limits campaign also found even fewer were bothered about developing a flabby chest, with only 16 per cent admitting it was something they feared.
National geographic released the survey on last Tuesday in launching a five-year campaign to improve geographic literacy among young people in the United States.
In addition to the TC4 campaign and AIM, a string of NASA climate-sensing satellites called the A-train is providing a global survey of the vertical profile of clouds.