Biological theories of aging involve changes on molecular, cellular, and systemic levels. Influences on biological changes include:

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Environmental factors such as exposure to toxins, nutrition, and stress can contribute to biological changes that lead to aging. Caregiver role strain and the number of crises a person has had in their lifetime may indirectly impact these factors, but they are not direct influences on biological changes. The ability to make choices may impact overall health and well-being, but it is not a direct influence on biological changes associated with aging.

Biological Theories of Aging Involve Changes on Molecular, Cellular, and Systemic