As a member, you'll also get unlimited access to over 79, lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed. Already registered? Log in here for access. Log in or sign up to add this lesson to a Custom Course. Log in or Sign up. Lisa has taught at all levels from kindergarten to college and has a master's degree in human relations. When you think of human development, what is the first thing that comes to mind? Most likely the first image you have is of a teenager going through the stages of puberty.
The Physiological Peak
Early and Middle Adulthood
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Network Connection Required to View this Feature. Section 1, Article 1 - By the time that individuals are to years-old, their physical bodies have reached maximum growth. Emerging adults are as tall and strong as they are ever going to be. Some of the key physical changes that take place are muscle growth, strengthening of the bones, and body shape changes. Adult development and aging: Biopsychosocial perspectives 4th ed. Hoboken, NJ: Wiley. Additionally, every body system has reached full maturity and functions at peak performance.
Age clocks, or the internal sense of timing of physical and social events, determine the various life stages through which adults pass. Although people age at different rates, the majority of Americans, reinforced by social norms, pass through a series of predictable periods. According to Levinson, the ages of 17 to 45 encompass early adulthood, which he divides into the novice phase 17—33 and the culminating phase 33— The culminating phase 33—45 consists of the settling down 33—40 and midlife transition 40—45 stages.