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What are the five focuses of study in gerontology?

According to the World Health Organization, the global population of people aged 60 years and older is projected to more than double by 2050. This demographic shift makes understanding the multidimensional process of aging more critical than ever, which is why gerontology, the scientific study of aging, is a growing field of research. But what are the five focuses of study in gerontology? They include the biological, psychological, social, financial, and policy aspects of aging.