fact of life

noun
1.
any aspect of human existence that must be acknowledged or regarded as unalterable: Old age is a fact of life.
Idioms
2.
facts of life, the facts concerning sex, reproduction, and birth: to teach children the facts of life.

Origin:
1850–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Their statement now describes an ordinary fact of life.
To hijack a word--marriage--that so clearly represents a naturally observable
  fact of life makes no sense.
Everything in the universe undergoes change, it is a fact of life.
The danger from avalanches is a fact of life for snowmobilers.
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