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), the elderly, and elders (in many cultures—including the cultures of aboriginal people).
Old people often have limited regenerative abilities and are more susceptible to disease, syndromes, and sickness than younger adults. At what age old age begins cannot be universally defined because it differs according to the context.
The AARP allows couples in which one spouse has reached the age of 50 to join, regardless of the age of the other spouse.
The distinguishing characteristics of old age are both physical and mental.
Therefore, rather than lumping together all people who have been defined as old, some gerontologists have recognized the diversity of old age by defining sub-groups.
One study distinguishes the young old (60 to 69), the middle old (70 to 79), and the very old (80 ).
and the CPP (Canada Pension Plan) as early as age 60.
However, for its study of old age in Africa, the World Health Organization (WHO) set 50 as the beginning of old age.