Approximately what percentage decline in basal metabolism is seen in an 80-year-old person compared with a 40-year-old?

Name: Approximately what percentage decline in basal metabolism is seen in an 80-year-old person compared with a 40-year-old?
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Basal metabolism declines with age, with an approximate decline of 4-8 percent per decade after age 20. Therefore, an 80-year-old person would experience a decline in basal metabolism of 32-64 percent compared with a 40-year-old.

Approximately What Percentage Decline in Basal Metabolism Is Seen in an 80-Year-Old