Methodology

1. Lifespan

From the UN World Population Prospects (WPP) 2024 life tables by age and sex we take the chance of dying at each age and draw survival year by year. This is an average risk for a whole population, not anyone's fate.

In birth-year mode, 1950–2023 follows the real life table of each year in turn for someone born in the chosen year. Before 1950 values are estimated from a trend and shown with a low quality grade (E).

2. Events such as school, work, and health

We use country indicators (enrollment, income, access to health care, and so on) from the World Bank's World Development Indicators and Our World in Data as the basis for event chances. Figures like gross tertiary enrollment or GDP are not used as personal probabilities as-is; the observation year and source are kept with every value.

Where a country has no indicator, we fill it with the median of its income group and show it as quality D (substitute value).

3. Decisions and personality questions

Questions appear at fitting ages. Your answer applies to both lives equally, so the difference in results shows the part that comes from the conditions of the country of birth, not from your choice.

How strongly an answer changes a chance is a design value, not a statistic, and the screen keeps it visibly apart from statistics.

4. Era events

We compiled 225 major events since 1900 across 53 countries (coups, wars, economic crises, disasters, epidemics). Years and facts are checked against historical sources; the severity and direction of effect are simulation design values.

The average effect after 1950 is already inside the life tables, so mortality is not raised a second time.

5. Reproducibility

Randomness comes from a hash of a seed, so the same seed, data version, and rule version always give the same result. Share links carry these values so the same simulation can be viewed again.

Limits

• Country averages draw an individual life, so real experience can differ greatly.
• Indicators are observed in different years, and some countries have thin statistics.
• Event effects and decision effects are design values.
• English and Japanese text may not yet be reviewed by native speakers.