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- Adulthood | Development, Aging Maturity | Britannica
Adulthood, the period in the human lifespan in which full physical and intellectual maturity have been attained Adulthood is commonly thought of as beginning at age 20 or 21 years Middle age, commencing at about 40 years, is followed by old age at about 60 years A brief treatment of development
- What Makes Someone an Adult? - Psychology Today
Adulthood characteristics included socio-demographic milestones, such as marriage and parenthood; legal markers of adult status, such as the age of majority (18 in the UK); and psychological
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