Those 85 years of age and older are the fastest growing subpopulation in the United States. Because they represent a very small proportion of the population (just 1% in 1980), the oldest old have not been studied until recently. Much of the interest in this group is related to their growth (over 50% per decade in the past 50 years) coupled with their disproportionate use of public resources, particularly health and social services. Women are strikingly overrepresented among the oldest old, with a gender ratio of approximately 44 males for every 100 females age 85 and older.
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Zones et al. (1987) studied this question.
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