| cellular clock theory | Leonard Hayflick's proposition that the maximum number of times that human cells can divide is about 75 to 80
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| divided attention | State of concentrating on more than one activity at the same time
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| episodic memory | Retention of information about the where and when of life's happenings
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| explicit memory | Memory of facts and experiences that individuals consciously know and can state
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| free-radical theory | Microbiological explanation of aging that states that people age because normal cellular metabolism produces unstable oxygen molecules. These molecules ricochet around inside cells, damaging DNA and other cellular structures
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| implicit memory | Memory without conscious recollection; involves skills and routine procedures that are automatically performed
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| life expectancy | Number of years that will probably be lived by the average person born in a particular year
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| life span | Maximum number of years an individual can live; has remained at approximately 120 to 125 years of age
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| semantic memory | Knowledge about the world that includes one's fields of expertise, general academic knowledge, and "everyday knowledge"
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| sustained attention | State of readiness to detect and respond to small changes occurring at random times in the environment
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| wisdom | Expert knowledge about the practical aspects of life that permits excellent judgment about important matters
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| hormonal stress theory | The theory that aging in the body's hormonal system can lower resilience to stress and increase the likelihood of disease
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