"in the age range" is correct and usable in written English.
You can use it to specify a range of ages, for example: "We found that the majority of participants were in the age range of 18-30 years old."
Subjects were mostly middle-aged, about half in the age range 40-59 y.
"Ellen Tracy has an extremely loyal base, in the age range of 40 to 50," she added, "and we have a lot that appeal to younger women.
They were in the age range 16 32 (mean age: 24.5).
The age specific prevalence was 7.3 % in the age range of 45 54 years.
In males, migraine prevalence peaked at 33.5% in the age range 30 40 y; in females there was a plateau at 37-40% in the age range 20 60 y.
The images were taken from 20 normal subjects from both genders, in the age range from 16 to 49 years.
Out of the total, 590 (53.4%) were in the age range of 45 54 years (Table 1).
It affects men and women equally, mainly in the age range of 35−55 years [2, 28].
Overall, the effect is strongest in the age range of 25-40 year olds and for same-sex pairs.
Both forms of PP occurred mainly in the age range between 7-13 years old (p=0.04).
Currently there is no test specifically designed to support diagnosis and monitor change in the age range 16 30 years.
