It was written during the 1970s that 75% of the people who had ever been born were alive at that moment. This was false.
Assuming that we start counting from about 50,000 B.C., the time when modern Homo sapiens appeared on the earth (and not from 700,000 B.C. when the ancestors of Homo sapiens appeared, or several million years ago when hominids were present), taking into account that all population data are a rough estimate, and assuming a constant growth rate applied to each period up to modern times, it has been estimated that a total of approximately 106 billion people have been born since the dawn of the human species, making the population currently alive roughly 6% of all people who have ever lived on planet Earth.

Others have estimated the number of human beings who have ever lived to be anywhere from 45 billion to 125 billion, with most estimates falling into the range of 90 to 110 billion humans.

World Population clock: sources and methodology
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The world population counter displayed on Worldometer takes into consideration data from two major sources: the United Nations and the U.S. Census Bureau.

The United Nations Population Division of the Department of Economic and Social Affairs every two years calculates, updates, and publishes estimates of total population in its World Population Prospects series. These population estimates and projections provide the standard and consistent set of population figures that are used throughout the United Nations system.

The World Population Prospect: the 2022 Revision provides the most recent data available (released in July of 2022). Estimates and projected world population and country specific populations are given from 1950 through 2100 and are released every two years. Worldometer, as it is common practice, utilizes the medium fertility estimates.

Data underlying the population estimates are national and sub national census data and data on births, deaths, and migrants available from national sources and publications, as well as from questionnaires. For all countries, census and registration data are evaluated and, if necessary, adjusted for incompleteness by the Population Division as part of its preparations of the official United Nations population estimates and projections.

The International Programs Center at the U.S. Census Bureau, Population Division also develops estimates and projections based on analysis of available data (based on census, survey, and administrative information) on population, fertility, mortality, and migration for each country or area of the world. According to the U.S. Census Bureau, world population reached 7 billion on March 12, 2012.

For most countries adjustment of the data is necessary to correct for errors, omissions, and inconsistencies in the data. Finally, since most recent data for a single country is often two years old on average, the current world population figure is necessarily a projection of past data based on assumed trends. As new data become available, assumptions and data are reevaluated and past conclusions and current figures may be modified.

For information about how these estimates and projections are made by the U.S. Census Bureau, see the Population Estimates and Projections Methodology.
Why Worldometer's Population Clock is the most accurate
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The above world population clock is based on the latest estimates released in July of 2022 by the United Nations. It will show the same number wherever you are in the world and whatever time you set on your PC.

Visitors around the world visiting a PC clock based counter, instead, will see different numbers depending on where they are located. This is the case with other world population clocks - such as the one hosted on a United Nations website, reaching 8 billion in 24 different instances (one per hour) on November 15, 2022, when each local time zone reached 12:10:08. Similarly, in 2011,