A national poll found that only 28% of American adults expect to live past the age of 70. The poll's margin of error was 3 percentage points at a 95% confidence level. This means that: The percent of all adults who expect to live past the age of 70 is between 25% and 31%. There is a 95% chance that the percent of all adults who expect to live past the age of 70 is between 25% and 31%. The poll used a method that gets an answer within 3% of the truth about the population 95% of the time. If the organization takes another poll on this issue, the results of the second poll will lie between 25% and 31%