| chronic disorders | Illnesses characterized by slow onset and long duration
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| climacteric | Midlife transition in which fertility declines
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| crystallized intelligence | Individual's accumulated information and verbal skills
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| expertise | Extensive, highly organized knowledge and understanding of a particular domain
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| fluid intelligence | Individual's ability to reason abstractly
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| menopause | Complete cessation of a woman's menstruation; usually occurs in the late 40s or early 50s
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| middle adulthood | Developmental period beginning at approximately 40 years of age and extending to about 60 to 65 years of age
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| sarcopenia | Age-related loss of muscle mass and strength
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| working memory | Mental "workbench" where individuals manipulate and assemble information when making decisions, solving problems, and comprehending written and spoken language
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