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What is the process of getting older called?

According to the World Health Organization, the number of people aged 60 years and older is expected to double to 2.1 billion by 2050. The process of getting older is most commonly known as **aging**, a complex and multi-faceted phenomenon involving a wide range of physical, psychological, and social changes. While the term *aging* is broadly used, the scientific community uses more specific terms to describe the different facets of this process, such as senescence, gerontology, and geriatrics.