First I will talk about the physical changes in early adulthood. Developmentalists look at adult physical functioning and begin to ask questions about loss or decline of function. There are two types of aging primary aging and social aging. Primary aging is age related physical changes that have biological basis. Social aging is age related changes due to environmental influences, poor health, habits or disease.
Adults in there 20's and 30's have more muscle tissue; maximum bone calcium; more brain mass; better eyesight, hearing, and sense of smell; greater oxygen capacity; and a more proficient immune system. The early adult is stronger, faster and better able to pick up from exercise or adapt to changing conditions. In early adulthood the declines in physical functioning are usually not noticeable unless a person is attempting operate at the unlimited boundary of physical ability; for example a speed skater. There is a general loss of speed and strength with age. Younger......
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