Furthermore, in the United States, the age of 18 is the age at which people are able to legally vote and citizens are granted full rights upon turning 21 years of age.According to Arnett, the term "young adulthood" suggests that adulthood has already been reached, but most people in the emerging adulthood stage no longer consider themselves adolescents, but do not see themselves entirely as adults either.
A number of studies have shown that regarding people in their late teens and early twenties in the United States, demographic qualities such as completing their education, finding a career, getting married, and becoming parents are not the criteria used in determining whether they have reached adulthood.
Emerging adults have reached a stage of full hormonal maturity and are fully, physically equipped for sexual reproduction.
Emerging adulthood is usually thought of as a time of peak physical health and performance as individuals are usually less susceptible to disease and more physically agile during this period than later stages of adulthood.
Many connections within the brain are strengthened and those that are unused are pruned away.
Several brain structures develop that allow for greater processing of emotions and social information.