Each requirement is evaluated for one country, sex and single year of age, and the results are added up. Within one year of age the traits are treated as independent, except education, living with a partner, single parenthood and living with parents, which come from one joint census table. Real correlations (between height and income, or eye and hair colour) are not modelled, so the result is a good estimate rather than an exact count. The data stay on the server; the page only receives finished results.
| Requirement | Source | Table |
|---|
| Population | Eurostat, population on 1 January 2025 | demo_pjan |
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| Height | NCD-RisC (eLife 2016): mean height at 18 by year of birth. Standard deviation 6.5 cm for women and 7.1 cm for men. | ncdrisc.org |
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| Income | Structure of Earnings Survey 2022 (median, 10th and 90th percentile of monthly gross pay; differences by sex and age), raised by wage growth to 2024. Share in work from the Labour Force Survey 2025. | earn_ses22_mdeci, earn_ses22_20, nama_10_fte, lfsa_ergan |
|---|
| Education, partner, kids, parents | 2021 census: persons in a couple, single parents and children living with parents by education, age and sex | cens_21fe_r2 |
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| Marital status | 2021 census by single year of age | cens_21m |
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| City or countryside | 2021 census by degree of urbanisation | cens_21urb01 |
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| Build, smoking, alcohol, sport | European Health Interview Survey 2019 | hlth_ehis_bm1e, hlth_ehis_sk1e, hlth_ehis_al1e, hlth_ehis_pe2e |
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| Foreign languages | Adult Education Survey 2022 | edat_aes_l22 |
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| Ethnicity | Estimated from the country of birth: Eurostat 2025 and the 2021 census | migr_pop3ctb, cens_21cob_r3 |
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| Faith | Special Eurobarometer 516 (2021), question D90.2, by country and age group; Muslim share from Pew Research Center (2016) | data.europa.eu, pewresearch.org |
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| Eyes and hair | Katsara & Nothnagel 2019, a review of population studies; spread across Europe by inverse distance weighting (p = 2), as in the paper | doi:10.1016/j.fsigen.2019.01.001 |
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| Map | Natural Earth 1:50m (world-atlas) | naturalearthdata.com |
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