[psychology] A young adult, according to Erik Erikson`s stages of human development, is generally a person in the age range of 20 to 40, whereas an adolescent is a person aging from 13 to 19, although definitions and opinions vary. The young adult stage in human development precedes middle adulthood. A person in the middle adulthood stage a...
Found on
http://en.wikipedia.org/wiki/Young_adult_(psychology)

a teenager (used esp. by publishers and librarians). · a person in the early years of adulthood.
Found on
https://www.infoplease.com/dictionary/young-adult
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