I've been kicking around a related idea for a while. A static "death day" is great because you can internalize, and countdown towards it, but it loses the distribution behind life expectancy. A single day is probability's expected value, but there's a huge range of days that could be your last - even today!

My idea is a daily (or weekly/monthly/etc) notification that re-computes a "death day" for you, on that recurring basis. Each notification would include a day, and together, they'd form a distribution that faithfully represents the variance in days you're likely to die.

For example: me; 28-year-old male. I'd regularly get "death days" that are ~50 years out. Occasionally, maybe they'd be 25, or 55 years away. And very rarely, they'd be things like 10, or even 5 years away. A perfect reminder to play hooky, or call up a friend, or tick off a bucket list item every once in a while!

Anyone interested in this? I'm kind of fishing for an excuse to build it...