fact of life

American  

noun

1. any aspect of human existence that must be acknowledged or regarded as unalterable.

   Old age is a fact of life.

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idioms

1. facts of life, the facts concerning sex, reproduction, and birth.

   to teach children the facts of life.

Etymology

Origin of fact of life

First recorded in 1850–55

Example Sentences

Christmas week sparked a Santa Claus rally, but a stock market that’s posted three straight years of above-average gains will have to wrestle with a simple fact of life—it’s incredibly hard to stay perfect.

From Barron's

Christmas week sparked a Santa Claus rally, but a stock market that’s posted three straight years of above-average gains will have to wrestle with a simple fact of life—it’s incredibly hard to stay perfect.

From Barron's

Christmas week sparked a Santa Claus rally, but a stock market that’s posted three straight years of above-average gains will have to wrestle with a simple fact of life—it’s incredibly hard to stay perfect.

From Barron's

Americans, she says, shouldn't accept mass shootings as a fact of life.

From BBC

Whether this shift in taste is a gooden thing or a baden one is a matter of opinion, but that it happens is a fact of life, and no amount of burying one’s head in the sand will make it otherwise.

From Literature