the timeframe of growth when physical maturation is has been attained and specific biologic, mental, cultural, individual characteristics, and various other developments concerned with getting older have taken place. Starting post-adolescence, this period of time is often grouped into categories by age, from young adulthood, which is generally considered to be between the ages of 19 and 45, to middle adulthood from 45 to 60, and the later years thereafter.
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