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  1. Adulthood | Development, Aging & Maturity | Britannica

    Adulthood, the period in the human lifespan in which full physical and intellectual maturity have been attained. Adulthood is commonly thought of as beginning at age 20 or 21 years.

  2. Adult development - Wikipedia

    Adult development is a somewhat new area of study in the field of psychology. Previously it was assumed that development would cease at the end of adolescence. Further research has …

  3. Adulthood - University of Central Florida Pressbooks

    By the time we reach early adulthood (20 to early 40s), our physical maturation is complete, although our height and weight may increase slightly. In young adulthood, our physical abilities …

  4. Adulthood | Introduction to Psychology - Lumen Learning

    By the time we reach early adulthood (20 to early 40s), our physical maturation is complete, although our height and weight may increase slightly. In young adulthood, our physical abilities …

  5. Adult Development Stages and Cognitive Changes in Later Life

    Mar 9, 2025 · Adult development involves psychological, cognitive, and social transformations, characterized by distinct stages such as early adulthood, midlife, and late adulthood, …

  6. What It Means to Be an Adult Today

    Adulthood is the longest phase of life—and getting longer. Most of the world’s population are adults, as, it is likely, you are. But what, exactly, is an adult? Legally, the age at which...

  7. APA Dictionary of Psychology

    Nov 15, 2023 · n. the period of human development in which full physical growth and maturity have been achieved and certain biological, cognitive, social, personality, and other changes …

  8. ADULTHOOD Definition & Meaning - Merriam-Webster

    from Latin adultus "having grown up," from adolescere "to grow up" — related to adolescence. : fully developed and mature. : a person who has reached an age specified by law compare …

  9. 11.1 Becoming an Adult - Lifespan Development | OpenStax

    This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.

  10. Adulthood | Springer Nature Link (formerly SpringerLink)

    Dec 13, 2025 · Adulthood is the time when the development results in the previous stages are all manifested, and it directly affects people’s psychology in their old age. The main task during …