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The phrase "age is fixed" is correct and usable in written English.
It can be used in contexts discussing the immutability of a person's age or the concept of age in general.
Example: "In many cultures, it is believed that age is fixed and cannot be changed, regardless of one's experiences or achievements."
Alternatives: "age is unchangeable" or "age remains constant".
Exact(4)
After this, we talk a bit about age (Abi is 43 although her "inner age" is fixed in her late 20s) and about families – her childhood and her parents' divorce (she talks about the "bravery" it takes for people to admit their marriage is over).
Your chronological age is fixed and may be the quickest to calculate, but is the most misleading of the three.
The curves depict expected survival probabilities when age is fixed at 35 years demonstrating that those with low DBP and SBP have the highest age adjusted mortality rates.
Generally, this age is fixed at 58 or 60 for most of the salaried individuals.
Similar(56)
But what enabled the aviation age were fixed wings and powerful engines.
"When the age was fixed at 70, we were at a time when it was really old," Ms. Kaye said.
For meiotic investigation, PMCs in young flowers of about one week age were fixed in Carnoy II solution and stained in 2% (w/v) aceto-carmine solution.
For light microscopy, cardiac tissue from mice at 6 months of age was fixed in formaldehyde and mounted in paraffin blocks.
E12.5, E14.5, E16.5 fetuses and dissected organs from adult mice (3 months of age) were fixed overnight in a 10% buffered formalin solution (Sigma-Aldrich) at room temperature, dehydrated, paraffin-embedded, and sectioned according to standard procedures.
Genotype, tissue, and age are fixed effects, and subject is a random effect in the mixed model.
The cut-off age was fixed at 6 years since it was the cut-off for validated pain and satisfaction scales.
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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