How much longer?

Not as long as you'd think.

Check it out at howmuchlonger.me

How it's calculated

I'm using the very sparse data provided by the US Social Security Administration, which you can find here.

To smooth-out the curve a bit I assume that the life expectancy decreases linearly between successive years in that data set. I'm aware that it doesn't really do that.

Here's all I'm doing:

export function timeLeft(lifeObj, birthday) {
    var age = yearsDifference(birthday, new Date());
    var whole = Math.floor(age)
    var fraction = age - whole
    var upper = lifeObj[whole.toString()]
    var lower = lifeObj[(whole+1).toString()]
    return upper - ((upper-lower) * fraction);
}

timeLeft() returns the number of years someone has left on this planet. lifeObj is the Javascript object that holds the actuarial data I'm using.

Why I built it

I'm trying to see what the fuss over React is about. Oh and to remind everyone about their inescapable mortality.