Define: 1) Infancy - 2) Childhood - 3) Adolescence - 4) Adulthood - 5) Old age - Don't given wrong answers. Don't copy from góogle. I will mark the correct answer as brainliest. Please .

Define: 1) Infancy - 2) Childhood - 3) Adolescence - 4) Adulthood -

1.	Define: 1) Infancy - 2) Childhood - 3) Adolescence - 4) Adulthood - 5) Old age - Don't given wrong answers. Don't copy from góogle. I will mark the correct answer as brainliest. Please .
Answer» 1. Infancy, among humans, the period of life between birth and the acquisition of language approximately one to two years later.2.Childhood, period of the human lifespan between infancy and ADOLESCENCE, extending from ages 1–2 to 12–13.3.Researchers suggest adolescence undergo three primary developmental STAGES of adolescence and young adulthood --early adolescence, MIDDLE adolescence, and late adolescence/young adulthood.4.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.Explanation:Old age refers to ages nearing or surpassing the life EXPECTANCY of human beings, and is thus the end of the human life cycle. Terms and euphemisms include old people, the elderly, OAPs, seniors, senior citizens, older ADULTS, and the elders.