Age Validation: The process of verifying a person’s age. In the case of centenarians this may be from birth certificate or by multiple other forms of proof that are consistent with one another. including the ages of family members from various generations before and after the person in question.

Centenarian: Age 100 years or older.

Geriatrics: Pertaining to the medical care of older people.

Gerontology: The biomedical and social study of aging.

Life Expectancy (Average): The average number of years that an average person of a given age may be expected to live, usually as determined by mortality tables.

Life Span: The age of death of the longest-lived member of the species. Madame Calment has defined the life span of the human species as 122 years.

Neuropsychology: The branch of psychology pertaining to the study, evaluation, and remediation of neurological and impairments by psychological means.

Nonagenarian: A person age 90 years to 99 years old.

Octagenarian: A person age 80 years to 89 years old.

Prevalence: The number of cases of an observation in a specified population at a given time.

Proband: The original individual, who because of their specific characteristic (e.g. extreme longevity) causes a study of other family members to determine if they have the same characteristic and if they have hereditary or genetic factors in common that could explain such a coincidence.

Relative Risk: The chance of an observation occurring in association with a set of individuals compared to another set.

Super-Centenarian: Age 110 years or older.

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