Population by year born is a measure of how many people were born in a given year, and how they contribute to the overall population size and structure. Population by year born can be used to analyze various demographic trends, such as fertility, mortality, migration, and aging.
One way to visualize population by year born is to use a population pyramid, which shows the distribution of population by age and sex for a given year. A population pyramid can reveal the history of a population’s growth and decline, as well as its current and future challenges. For example, a population pyramid with a wide base and a narrow top indicates a high birth rate and a young population, while a population pyramid with a narrow base and a wide top indicates a low birth rate and an aging population.
Another way to visualize population by year born is to use a cohort component method, which projects the future population by applying assumptions about fertility, mortality, and migration to each birth cohort (a group of people born in the same year). A cohort component method can show how population by year born changes over time, and how different scenarios of demographic change affect the population size and structure.
According to the [World Population by Year](^1^) data from Worldometer, the world population was around 8 billion in 2023, and it is projected to reach 9.7 billion by 2050, and 10.9 billion by 2100, based on the medium-fertility variant of the United Nations. The annual number of births peaked at 139 million in 1990, and has since declined to 131 million in 2020. The annual number of deaths has increased from 50 million in 1950 to 59 million in 2020, and is expected to rise further to 81 million by 2100.
The [Births per year](^2^) data from Our World in Data shows that the number of births per year varies by world region. Africa has the highest number of births per year, with 42 million in 2020, followed by Asia with 39 million, and Latin America with 15 million. Europe has the lowest number of births per year, with 5 million in 2020, followed by North America with 6 million, and Oceania with 1 million. The number of births per year is projected to decline in most regions, except for Africa, which is expected to increase to 68 million by 2100.
The [How big was the world’s population when you were born?](^3^) interactive tool from The Guardian allows you to find out the world’s population on your birth date, and how different countries were growing at that time. For example, if you were born on October 24, 2011, the world population was 6.97 billion, and
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