Daily Dose / Oct 12, 2026 / Human Height

The Twenty-
Centimetre Gap

Over one century almost everyone got taller, some populations by an astonishing amount. But the distance between the world's tallest and shortest nations hardly moved.

20.2cm

The biggest growth spurt on recordSouth Korean women born in 1996 are 20.2 cm taller than those born in 1896. They went from the fifth-shortest women in the world to the tallest third. NCD-RisC, eLife 2016 · 18.6 million people measured · 200 countries

01 · The spectrum

From 149 cm to 182 cm

Average adult height for people born in 1996 spans a range of more than 30 cm across countries. Women are shown above the strip, men below.

149.4Guatemala
shortest women

>168Latvia · Netherlands
tallest women

~160Timor-Leste · Yemen · Laos
shortest men

182.5Netherlands
tallest men

140 cm150160170180185 cm

Scale Each tick on the strip is 1 cm. Men were taller than women in every country, by about 11 cm on average for the 1896 cohort and about 12 cm for the 1996 cohort.

02 · A century apart

Everyone rose, but the gap didn't close

Compare the tallest and shortest national averages for people born in 1896 with those born in 1996.

MenWomen

Men: the gap between the tallest and shortest countries widened from about 19 cm to 22–23 cm.

Women: the gap was about 20 cm in 1896 and is still about 20 cm.

A Guatemalan woman born in 1896 averaged 140.3 cm, the height of a well-nourished 10-year-old girl today. A Lao man born that year averaged 152.9 cm, the height of a well-nourished 12½-year-old boy.

Solid = tallest country · dashed = shortest

03 · Winners and losers

Who grew the most, and who shrank

Change in average adult height. East Asia and Iran gained the most. Parts of sub-Saharan Africa have lost ground since the 1960s.

South Korean women1896 → 1996 cohorts

+20.2 cm

Iranian men1896 → 1996 cohorts

+16.5 cm

South Korean men1896 → 1996 cohorts

+15.2 cm

Niger · Rwanda · Sierra Leone · Ugandafrom early-1960s peak

about −5 cm

Note The bars measure two different things. The gains are over the full century. The losses are from each country's peak height to later cohorts, about 5 cm "in some countries," as the study puts it. Bars are drawn on the same cm scale.

04 · The plateau

Where growth stalled, by birth cohort

Height growth didn't stop everywhere at once. Each population hit its ceiling at a different point.

USAAmong the tallest a century ago, it had the smallest gain of any high-income country.

Sub-Saharan AfricaHeights fall or stall in cohorts born after the early 1960s.

JapanThe rise stops in cohorts born after the early 1960s.

South KoreaMen flatten in 1980s cohorts and now out-measure the Japanese.

India · BangladeshGrowth plateaus 5–10 cm below Japan and South Korea.

1896 cohort19201940196019801996 cohort

Note The events are placed in sequence, not at exact cohort years. China and Thailand are still getting taller. Chinese adults have overtaken the Japanese but not yet South Koreans.

05 · The stakes

Height is a record of childhood

Adult height largely reflects nutrition and health in the early years. The gap is still being built today.

150.2M

children under 5 were stunted (too short for their age) in 2024. That is 23.2% of all young children.

UNICEF/WHO/World Bank JME 2025

46M

children by which the world is projected to miss its 2030 goal of cutting stunting to 90 million.

JME 2025 · projection (modeled)

17%

lower cardiovascular mortality in tall countries than short ones across the ~20 cm range. The flip side is a 20–40% higher risk of some cancers.

NCD-RisC 2016 · if associations are causal

Stunting prevalence, under-5s

Endpoints only The line connects the two published values and does not show the year-by-year path. JME says prevalence has plateaued since 2021 at about 150 million children.

Almost all stunted children live in Asia (51%) and Africa (43%).

Between 2012 and 2024 the number of stunted children rose by 13.7% in low-income countries and 7.6% in sub-Saharan Africa, even as the global rate fell.

Boys are slightly more affected: 24.4% vs 21.9% for girls.

06 · Why it matters / what you can do

Read a country's height like a ledger

Treat height as a health metric. A population's average height records the food, clean water and illness its children lived through.
Back the first 1,000 days. Programmes focused on maternal and infant nutrition are where stunting is prevented. Check your country's JME data.
Watch where the gains stall. The populations shrinking since the 1960s are a warning sign. Their gaps are widening, not closing.
Don't read it as destiny. South Korea gained 20 cm in a century. Height responds quickly once conditions improve.

Sources & notes

NCD Risk Factor Collaboration (NCD-RisC). "A century of trends in adult human height." eLife 5:e13410, 2016. Covers 1,472 population-based studies, 18.6M participants and 200 countries, for birth cohorts 1896–1996. Source for all country heights, gains, the 1896/1996 gaps, the plateau and decline patterns, the male–female difference and the cardiovascular/cancer associations.
UNICEF, WHO, World Bank. Levels and trends in child malnutrition: Joint Child Malnutrition Estimates, 2025 edition. Source for 150.2M stunted (23.2%) in 2024, the Asia/Africa shares, the 46.0M projected shortfall against the 2030 target of 90M, and boys 24.4% vs girls 21.9%.
United Nations. Sustainable Development Goals Report 2025, Extended Report, Goal 2. Source for prevalence of 26.4% (2012) to 23.2% (2024), the plateau since 2021, and increases of 13.7% (low-income countries) and 7.6% (sub-Saharan Africa) in numbers stunted.

FLAGS Values marked "~" or ">" are given as approximate or threshold values in the source. The "about −5 cm" decline is the study's approximate figure for some countries. The 2030 shortfall is a modeled projection. The cardiovascular and cancer figures are associations that the authors frame as conditional on causality. The stunting chart connects two published endpoints only. The plateau timeline shows sequence, not exact years.

The Twenty-Centimetre Gap