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fact of life

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noun
  1. any aspect of human existence that must be acknowledged or regarded as unalterable: Old age is a fact of life.
Idioms
  1. facts of life, the facts concerning sex, reproduction, and birth: to teach children the facts of life.

Origin of fact of life

First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018