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Young adult

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A young adult is a person in the years following adolescence. This phase is a major part of human development. It typically precedes middle adulthood. Definitions of the term vary across different fields. In medicine and social sciences, it often covers ages 18 to 45. Some researchers define the phase as lasting from 18 to 25 or 18 to 35. The United States Census Bureau uses the range of 18 to 34. This includes over 65 million Americans born between 1991 and 2008.

Defining the exact timeline of young adulthood is difficult. It depends on many overlapping indices. These include legal, occupational, and emotional factors. Some experts use a developmental perspective to study growth. Others use a socialization perspective. Because of these different views, the timeline is very flexible. In the twenty-first century, age norms for major life events have become highly elastic. Generational changes have also made the path to adult responsibilities less predictable. Changes in college costs and work opportunities mean people experience many transitions.

Biological development continues throughout this period. For a long time, scientists thought the brain finished developing around age 25. However, recent studies suggest this process extends into the early 30s. Physically, this is often the healthiest time of life. Strength and physical performance reach their peak between ages 18 and 46. While physical capacity is high, flexibility may decrease as people age. Young adults are generally free from the diseases of senescence, which is the process of biological aging.

Psychological theories help explain how young adults grow. Erik Erikson was a major influence on these definitions. He believed that after searching for an identity in adolescence, young adults seek intimacy. Intimacy is the capacity to commit to close partnerships and affiliations. Erikson noted that people must face the fear of ego loss to achieve this. Avoiding closeness can lead to a deep sense of isolation. Young adults also work on their moral values. They move from the ideological mind of a teen to an ethical sense.

Another researcher, Daniel Levinson, proposed a theory of life courses. He saw life as a series of four distinct eras. The first is preadulthood, which lasts until roughly age 22. This includes the Early Adulthood Transition from ages 17 to 22. This transition acts as a developmental bridge. The second era is Early Adulthood, lasting from age 16 or 17 to 45. This era contains the most energy, contradiction, and stress. It is a time for pursuing ambitions and forming families.

Levinson's model continues into Middle Adulthood, starting at age 45. During this time, biological and mental capacities may begin to decline. The final era is Late Adulthood, which begins at age 65. Within Early Adulthood, there are also specific sub-phases. The middle to late 30s are often called the establishment phase. This involves making major life investments in work, family, and community. Some call the period from ages 33 to 40 the Culminating Life Structure. This helps individuals realize their youthful aspirations.

Health challenges can arise during these years. While mortality rates are low in developed countries, risks exist. About 75% of deaths in young adulthood result from risky behavior or mental health crises. Risks include motor vehicle incidents, violence, and substance use. Men are more likely to die during the 18 to 25 age group. This is often due to accidents or suicide. Globally, there has been an increase in mental illness among young adults. This can be linked to diet and exercise habits.

In certain regions, specific diseases impact this age group heavily. In sub-Saharan Africa, HIV/AIDS has significantly increased mortality. For African males, deaths increased between ages 20 and 55. For African females, the increase was between ages 20 and 45. In South Africa, this reduced life expectancy by 18 years. In Botswana, it reduced life expectancy by 34 years. Finally, the term "young adult" is used in the literary industry. These books target readers as young as 13 or 14. This usage is often disputed because those readers are not legal adults.

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