What actually triggered my idea was a recent DNaaS HN post [1] that tells you your expected life expectancy and other cool facts based on your country and birthdate which I was reluctant to input my actual birthday.
But anyway, thanks for the link!
For the curious, this is their methodology:
> Remaining life expectancy at specific age (in days) was obtained by interpolating (spline) the 5 yearly/duration age-specific period life expectancies.
> Population.io uses official demographic data produced by the United Nations and published in the World Population Prospects