Old people often have limited regenerative abilities and are more susceptible to disease, syndromes, and sickness than younger adults. The organic process of ageing is called senescence, the medical study of the aging process is gerontology, and the study of diseases that afflict the elderly isgeriatrics.The elderly also face other social issues such as retirement, loneliness, and ageism.
Four dimensions
Old age comprises the four dimensions: chronological, biological, psychological, and social. Chronological age may differ considerably from a person’s functional age. The distinguishing marks of old age normally occur in all five senses at different times and different rates for different persons. In addition to chronological age, people can be considered old because of the other three dimensions of old age.For example, people may be considered old when they become grandparents or when they begin to do less or different work in retirement.
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