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What age is classed as an older adult? Decoding the shifting definition

According to the World Health Organization (WHO), the number of people aged 60 and older is projected to increase from 1 billion in 2019 to 1.4 billion by 2030. Answering the question, "What age is classed as an older adult?" is not straightforward, as the benchmark varies significantly depending on the context, such as for government benefits, social programs, or healthcare assessments.