"a given age" is correct and usable in written English.
You can use it to refer to a specific age that has been previously mentioned or is otherwise implied. For example: "At a given age, children may be ready to begin formal education."
Life expectancy is the average number of years of life remaining for people who have attained a given age.
Most state judges are electorally accountable in some way, and almost all must retire at a given age.
The same great causal factors underlie any cultural artifact of a given age and society, he claims.
Crucially, as life expectancy rises citizens would get the message that they need to work longer as available annuity rates at a given age decline.
The British Board of Film Classification (BBFC) operates exactly such a scheme in determining which imagery is suitable for a given age rating.
The plan will calculate how much is needed to pay for the college education, including room and board, of a child of a given age.
An activity rate is the proportion of the whole number in a given age and sex group for example, females aged 30 34 who work for gain.
Evolutionary biologists believe that this is because boys (and, indeed, males in general) are more likely to die at a given age than are their female contemporaries.
In contrast to Hegel's philosophical idealism, however, Marx held that history is driven by the material or economic conditions that prevail in a given age.
Company rules that oblige businessmen to go by a given age, such as those that forced Mr Romiti out of Fiat, might seem harsh.
But within a given age group, it must apply the same premium to all comers, regardless of their health and their gender.
