Final answer:
Adulthood is the stage of life that starts around 20 years old and is divided into early, middle, and late stages, with each featuring specific developmental changes and societal expectations.
Step-by-step explanation:
Stages of Adulthood
Adulthood is typically considered the longest stage of life, encompassing early, middle, and late adulthood. It begins around the age of 20 and may extend up to 80 years or beyond. For some, like the man celebrating his 110th birthday in Figure 23.8.2, adulthood has already spanned over nine decades.
Early Adulthood
Early adulthood, starting at age 18 or 21, continues until the mid-30s. This is the period when individuals are at their physical peak and in good health, with the greatest fertility. It is also the time when they complete their education, embark on careers, and often start families.
Middle Adulthood
In middle adulthood, people may face increasing health risks as they grow older. Nonetheless, they continue to evolve socially, switching from the pleasures of youth to embracing more responsibilities.
Late Adulthood
The final stage, late adulthood, is marked by further physical, cognitive, and social changes. At this point in life, society's expectations evolve, with an emphasis on settling down and focusing on commitments like family and career.