2025年1月17日 · By the end of 2025, millennials will range from 29 years old to 44 years of age. Pew Research Center explains that millennials are among the most racially and ethnically diverse adult...

Late Childhood (Ages 9-11): Ingenuity – Older children have acquired a wide range of social and technical skills that enable them to come up with marvelous strategies and inventive solutions for dealing with the increasing pressures that society places on them.

Millennials were born between 1981 and 1996, currently making them 28 to 43 years old. They got their name from the 1991 book, "Generations," by historians Neil Howe and William Strauss, who tagged...

What is the age profile of populations around the world? How did it change and what will the age structure of populations look like in the future? This page was first published in September 2019, and last revised in February 2024. The global median age has risen over time, as older people make up an increasingly large percentage of the population.

2019年1月17日 · Anyone born between 1981 and 1996 (ages 23 to 38 in 2019) is considered a Millennial, and anyone born from 1997 onward is part of a new generation.

2024年11月6日 · As society progresses, these generational names serve not just as labels, but as markers of the evolving cultural, technological, and social landscapes. Understanding these distinctions helps in recognizing the diverse perspectives and contributions of each generation, fostering intergenerational collaboration and appreciation.

2024年10月25日 · Learn about characteristics such as percent of population, population change from 2010, percent female, and racial and ethnic diversity index and prevalence for a variety of age groups for the nation, states, counties and census tracts.

2025年1月6日 · Move over, Gen Z and Gen Alpha: Generation Beta is officially the most accurate label to describe the youth of today. The Pew Research Center periodically updates the age ranges it uses to...

An analogy is U.S. university structure, in which cohorts called classes (e.g., the class of 2023) pass through a series of ranks called years (i.e., frosh, sophomore, junior, and senior). Such structural arrangements have been called age group systems, age set systems, and age class systems (Bernardi 1952, 1985; Prins 1953; Stewart 1977).

age-related factors scale up to influence societal structure and ecological outcomes (§3b), and their consequences for fitness and evolutionary outcomes (§3c). We also then identify current challenges and considerations in dissecting the age-sociality