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The phrase "a life span" is correct and usable in written English.
It can be used when discussing the duration of life of an organism, object, or concept.
Example: "The average life span of a domestic cat is around 15 years."
Alternatives: "a lifespan" or "a life expectancy".
Exact(58)
"They have a life span," he said.
Some amenities have a life span all their own.
"It has a life span that's very short.
They have a life span of up to seven years.
Which suggests a life span for many seasons to come.
A life span of 70 years was considered.
With a life span of four weeks or less, the antler fly is no Methuselah.
Catch it while you can: the rooftop has a life span of 10 days.
Each version of SoBig was programmed with a life span, turning itself off after a month.
Similar(2)
Super, D. E. A life-span, life-space approach to career development.
Carstensen, L. L. Selectivity theory: social activity in a life-span context.
More suggestions(3)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com