At what age do middle age and old age begin, according to the general population? Do researchers use similar or different ages to define these categories?

Name: At what age do middle age and old age begin, according to the general population? Do researchers use similar or different ages to define these categories?
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The Answer of At what age do middle age and old age begin, according to the general population? Do researchers use similar or different ages to define these categories?

At What Age Do Middle Age and Old Age Begin