[abelgvidal]

how would you do it? what would you track?

[supermw]

The amount of years you've been alive divided by the life expectancy of your country.

[dragonwriter]

What do you mean “the life expectancy of your country”? Do you mean “the total (current + remaining) life expectancy for someone of your age in your country”? Or do you mean “the life expectancy at birth in your birth year in your country”? Or something else?