The thing about this tool is it answers the following question: given your gender and your age (and no other data about you), based on CDC data of mortality in the US, how many more years do you have left to live?
In reality, you'd likely better be able to predict your remaining years if you have more details about yourself (you should, unless you're Benjamin Kyle). Are you a long-term heavy smoker, overweight like most Americans, or do you work in a dangerous job like construction? You're more likely to live less. On the other hand, do you have a safe job, stay physically fit, and avoid alcohol and drugs? You're more likely to live more.
In reality, you'd likely better be able to predict your remaining years if you have more details about yourself (you should, unless you're Benjamin Kyle). Are you a long-term heavy smoker, overweight like most Americans, or do you work in a dangerous job like construction? You're more likely to live less. On the other hand, do you have a safe job, stay physically fit, and avoid alcohol and drugs? You're more likely to live more.