Yeah, if you put in an age older than 81, it just says how much over that limit they are living. It would be more impactful to see a tiny number of visits remaining.

You could also use WolframAlpha, e.g.: http://www.wolframalpha.com/input/?i=life+expectancy+in+usa+...

Though that's really the current life expectancy, no one actually knows future life expectancy, which depends on future technology.

Yes, I came here to say the same thing. They tried to correct for it by stating how far past life expectancy they are if you enter an age older that life expectancy at birth, but if you enter, say, one year less than life expectancy, you get an estimate of one year's worth of visits, which is not correct (or even close, really).

i wonder if life expectancy estimates change much when conditioned on the fact that you've had children.

or if you've had children who can read english and can access the internet