Final answer:
The second and third generation theories of aging are termed Cellular and molecular theories. They suggest that age-related changes are primarily due to biological factors such as molecular and cellular changes. The Free Radical Theory is one such example, which posits oxidative stress as a contributor to aging.
Step-by-step explanation:
The second and third generation theories of aging are referred to as Cellular and molecular theories. According to these theories, biological factors such as molecular and cellular changes, defined as primary aging, are the main contributors to the aging process. These theories include the Free Radical Theory, which suggests that accumulated cellular damage from oxidative stress contributes to the physiological and anatomical effects of aging.
On the other hand, secondary aging refers to aging that occurs due to controllable factors, such as lack of physical exercise and poor diet. Together, cellular and molecular theories of aging provide insights into the biological aspects of the aging process.
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