The phrase "age during which" is correct and usable in written English.
It can be used to refer to a specific period in someone's life characterized by certain experiences or developments.
Example: "The age during which children develop their language skills is crucial for their future communication abilities."
Alternatives: "period of life when" or "stage of development in which".
The current epoch, the Holocene, is the 12,000 years of stable climate since the last ice age during which all human civilisation developed.
The final age, the antithesis of the Golden Age, was the Iron Age, during which the poet himself had the misfortune to live.
I wanted to learn about their social and emotional developments, particularly during adolescence — the age during which boys are most heavily stereotyped as stoic and only interested in one thing (i.e., sex).
He regarded the conflict with horror, as an "abyss of blood and darkness," a challenge to the most fundamental assumptions of "the whole long age during which we have supposed the world to be … gradually bettering".
World War I botched civilization -- the plunge of which "in this abyss of blood and darkness," wrote Henry James, "is a thing that... gives away the whole long age during which we have supposed the world to be, with whatever abatement, gradually bettering".
This series has now seen more sixes than any other in Test history, although that's not hugely surprising given that it's one of the very few five-match series taking place in the T20 age, during which the six has become a far more desirable scoring option.
The study population consisted of women aged 44 56 years, the age range during which the risks of hypertension increase markedly in women [ 20, 21].
Within the limited age range during which AMH was measured, offspring age was not associated with AMH levels (per 6-months older age, ratio of geometric mean = 1.03, 95% confidence interval: 0.97, 1.09).
The age range during which the respondents first started having sex was from 13 to 29 years, with the mean age of 19 years; most were within the age group of 18 21 years (54.5%).
Circulating E2 levels are thus increased in the age range during which the SSc female:male ratio is highest.
Study members participated in a medical examination and lifestyle assessment at age 49 51 years during which IMT was measured using ultrasound techniques.
