Psychology
Psychology
5th Edition
ISBN: 9780134715308
Author: Ciccarelli
Publisher: PEARSON
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Chapter 8, Problem 19TY
Summary Introduction

Physical aging includes physical changes in adulthood. The sign of aging are malfunctioning of oil glands around eyes and neck. These signs contribute to wrinkles near the end of 20s and early 30s. Other changes include decline in vision and hearing that are not observable. There are many theories regarding physical aging of people such as cellular-clock theory, wear and tear theory, free radical theory and activity theory.

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