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Population momentum is a consequence of the demographic transition. Population momentum explains why a population will continue to grow even if the fertility rate declines. Population momentum occurs because it is not only the number of children per woman that determine population growth, but also the number of women in reproductive age.
The US Census Bureau defines baby boomers as those born between mid-1946 and mid-1964 (shown in red). [ 2 ] The middle of the 20th century was marked by a significant and persistent increase in fertility rates in many countries of the world, especially in the Western world. The term baby boom is often used to refer to this particular boom ...
World map of total fertility rates by country or territory. As of 2015, there were some two and a half million people born every week around the globe; Generation Alpha is expected to reach close to two billion by 2025. For comparison, the United Nations estimated that the human population was about 7.8 billion in 2020, up from 2.5 billion in 1950.
Baby boom. A baby boom is a period marked by a significant increase of births. This demographic phenomenon is usually ascribed within certain geographical bounds of defined national and cultural populations. The cause of baby booms involves various fertility factors.
Generation Alpha (often shortened to Gen Alpha) is the demographic cohort succeeding Generation Z. Researchers and popular media use the early 2010s as starting birth years to the mid-2020s as the ending birth years ( see § Date and age range definitions ). Named after alpha, the first letter in the Greek alphabet, Generation Alpha is the ...
Generation time. In population biology and demography, generation time is the average time between two consecutive generations in the lineages of a population. In human populations, generation time typically has ranged from 20 to 30 years, with wide variation based on gender and society. [1] [2] Historians sometimes use this to date events, by ...
General fertility rate (GFR) - the number of births in a year divided by the number of women aged 15–44, times 1000. It focuses on the potential mothers only, and takes the age distribution into account. Child-Woman Ratio (CWR) - the ratio of the number of children under 5 to the number of women 15–49, times 1000.
Generation Alpha. v. t. e. Baby boomers, often shortened to boomers, are the demographic cohort preceded by the Silent Generation and followed by Generation X. The generation is often defined as people born from 1946 to 1964 during the mid-20th century baby boom. The dates, the demographic context, and the cultural identifiers may vary by country.