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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

    The concept of adulthood has legal and socio-cultural definitions. The legal definition [4] of an adult is a person who is fully grown or developed. This is referred to as the age of majority, which is age 18 in …

  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 are at their …

  4. The 3 Stages of Adulthood (And Their Characteristics)

    Explore the 3 stages of adulthood: early, middle, and late. Learn the key characteristics of each phase and how they shape our lives.

  5. 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 are at their …

  6. What It Means to Be an Adult Today - Psychology 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. 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, influenced by …