Oceania · TO
Generation Alpha & Beta
in Tonga
How many of each cohort Tonga has, how fast the next one is arriving, and what the fertility rate, median age and school system mean for both.
Tonga has approximately 36,070 Generation Alpha people (born 2010–2024), about 34.9% of its population, and roughly 4,157 Generation Beta children born since 2025. Its fertility rate is 3 and its child population is shrinking, projected -13% by 2040.
Births since 1 January 2025 at Tonga's own rate, less infant mortality. At 6 births a day it climbs steadily rather than visibly.
Born 2010–2024 — 34.9% of the population, aged 2–16 this year.
About 6 births a day, all of them Generation Beta.
Smaller than the Alpha cohort of 36,070.
Size of the Generation Alpha cohort
Share of the population under 15
Total fertility rate
Child population to 2040 (−13%)
Tonga against the world average
Key dates for Tonga
Born on 1 January 2025, they reach Tonga's starting age of 6.
15 compulsory years from age 6.
Under-15s change by −13% against today.
Eighteen years after the cohort opened.
The cohort closes on 31 December 2039; its youngest members enter school here.
School dates follow Tonga's own starting age of 6 and 15 compulsory years, so they differ from the global figures on our Generation Beta page.
Every figure on this page
Tonga in 20 numbers
| Indicator | Tonga | World average | Rank |
|---|---|---|---|
| Population | 103 thousand | — | #176 of 194 |
| Generation Alpha (born 2010–2024) | 36,070 | — | #170 of 194 |
| Gen Alpha share of population | 34.9% | — | #44 of 194 |
| Projected Gen Beta births 2025–39 | 34,550 | — | #171 of 194 |
| Births per year | 2,339 | — | #171 of 194 |
| Births per day | 6 | — | #171 of 194 |
| Under-15 share of population | 35% | 25% | #47 of 194 |
| Total fertility rate | 3 | 2.2 | #50 of 194 |
| Median age | 21 years | 31 years | #149 of 194 |
| Life expectancy at birth | 73 years | 73 years | #110 of 194 |
| Urban population | 21% | 58% | #189 of 194 |
| Internet use | 67% | 68% | #128 of 192 |
| Secondary school completion | 99% | 60% | #21 of 189 |
| School starting age | age 6 | — | #30 of 194 |
| Compulsory years of schooling | 15 years | — | #1 of 194 |
| Daily screen time, ages 8–12 | Not reported | — | |
| Cost of raising a child to 18 | Not reported | — | |
| Under-15 population change to 2040 | −13% | — | #128 of 194 |
| Youth dependency ratio | 60 per 100 adults | — | #45 of 194 |
| Mobile connections per 100 people | 62 | — | #175 of 194 |
Rank is out of the 194 countries profiled here and always runs highest first — so #1 on median age is the oldest country, not the youngest. World averages are population-weighted global figures and are shown only where a comparable one exists. Sources: UN World Population Prospects, World Bank Open Data, UNESCO and ITU, via our sources page.
1950 to 2023, with the UN projection to 2030
Tonga birth rate and fertility rate by year
About 2,400 babies were born in Tonga in 2023, and women had 3.13 children on average. Since 1950, births peaked in 1977 at about 3,500. Fertility has stayed above the replacement level of 2.1 in every year since 1950. Annual births are 20% lower than in 2000.
Fertility rate (children per woman)
Births per year
Thousands of births. Dashed: UN medium-variant projection.
| Year | Births | Fertility rate |
|---|---|---|
| 1950 | 2,100 | 6.70 |
| 1960 | 2,900 | 6.65 |
| 1970 | 3,300 | 6.07 |
| 1980 | 3,500 | 5.60 |
| 1990 | 3,300 | 4.93 |
| 2000 | 3,000 | 4.16 |
| 2010 | 3,000 | 3.88 |
| 2015 | 2,700 | 3.54 |
| 2020 | 2,500 | 3.23 |
| 2021 | 2,500 | 3.20 |
| 2022 | 2,500 | 3.17 |
| 2023 | 2,400 | 3.13 |
| 2025 projected | 2,400 | 3.07 |
| 2030 projected | 2,300 | 2.91 |
UN World Population Prospects 2024, republished by Our World in Data. Years to 2023 are UN estimates, which can differ from a country's own registered counts; later years are the UN medium-variant projection. Every country is ranked on fertility rate by country.
Regional peers
Elsewhere in Oceania
Australia
5 million Generation Alpha
New Zealand
1 million Generation Alpha
Samoa
83,940 Generation Alpha
Kiribati
47,580 Generation Alpha
Micronesia
35,960 Generation Alpha
Marshall Islands
11,890 Generation Alpha
Palau
3,160 Generation Alpha
Nauru
4,500 Generation Alpha
Run the numbers yourself
Tools that use this data
Gen Beta by Country Forecast
Where the 2.1 billion Betas will be born, and which countries shrink instead.
Under-15 Share by Country
The countries where Alpha and Beta make up the largest share of the population.
Global Child Population Table
Where the world's children are, ranked by region, with the direction each one is…
Median Age Calculator
What a country's median age implies about its Alpha and Beta share, its dependency…
School-Age Population Forecast
How many children will be of school age in any year, globally or nationally.
Where a tool takes a number it opens prefilled with Tonga's own figure rather than the world one, and every input stays editable. The rest are the same ranked tables for every country.
Frequently asked about Tonga
How many Gen Alpha are there in Tonga?
Approximately 36,070 people born between 2010 and 2024 live in Tonga, about 34.9% of the population.
How many Gen Beta children are there in Tonga?
Roughly 4,157 children have been born in Tonga since 1 January 2025, growing by about 6 every day.
What is the fertility rate in Tonga?
Tonga has a total fertility rate of 3 children per woman, against a replacement level of 2.1 and a world average of about 2.2.
At what age do children start school in Tonga?
Compulsory schooling begins at age 6 in Tonga, and runs for 15 years.
Is the child population in Tonga growing or shrinking?
It is shrinking. The under-15 population is projected to change by -13% between now and 2040.
How many babies are born in Tonga each year?
About 2,400 in 2023, according to UN estimates, down from a peak of about 3,500 in 1977 (the highest since 1950). The UN projects about 2,300 in 2030.
How has the fertility rate in Tonga changed over time?
It was 6.70 children per woman in 1950 and 3.13 in 2023. It has not fallen below the replacement level of 2.1 in any year since 1950.
AlphaBetaMinds (2026). Generation Alpha and Generation Beta in Tonga. Retrieved from https://alphabetaminds.com/countries/tonga
The printed sheet keeps the headline numbers, the world comparison, the key dates, the full indicator table and this citation, and drops the navigation, the tools and the FAQ. It fits a page or two and needs no login.
Free to reproduce, commercially or not, with a credit and a link. Figures are estimates for 2025–2026 and are updated when the underlying sources are.