The phrase "age ascertained" is correct and usable in written English.
It can be used in contexts where you need to confirm or determine someone's age, often in legal or formal documents.
Example: "The applicant's age ascertained through official documents meets the eligibility criteria for the program."
Alternatives: "age confirmed" or "age determined".
The US GWAS was based on 1281 cases (786 male; mean age 47 years) ascertained through the MD Anderson Cancer Center, Texas, between 1990 and 2008.
Briefly, the UK GWAS was based on 636 cases (401 male; mean age 46 years) ascertained through the INTERPHONE Study (Cardis et al, 2007; Shete et al, 2009).
56 The mean age of the patients in this study corresponds with the analysis of ages ascertained at the German national level.
From October 1 , 1995to September 30 , 1996all injury-related ED visits among District of Columbia residents <3 years of age were ascertained at the 10 hospitals where city children routinely sought care.
Cases between 20 and 79 years of age were ascertained through a rapid reporting system.
All incident cases (< 15 years of age) were ascertained during 1990 2005 within a 5-km radius of the Krümmel nuclear power plant.
Cases 0 14 years of age were ascertained from pediatric clinical centers; controls, matched to cases on date of birth, sex, race, and Hispanic ethnicity, were selected from the California birth registry (California Department of Public Health, Sacramento, CA).
Common morbidities of old age were ascertained by asking participants if they had ever been told by a doctor that they had arthritis, diabetes, hypertension, stroke, heart attack or angina, heart failure, poor circulation to the legs, asthma, emphysema, osteoporosis and cancer.
Gestational age was ascertained by the mothers' attending lead maternity carer or admitting consultant obstetrician.
Age was ascertained on the basis of self-report, documentation, and a relative's confirmation.
