There are several ways one can use to establish someone’s age, but very few ways of confirming it. You can determine someone’s age by using the person’s birth records, identity cards and passports.
1 Additional Answer
You can find out someone's age by visiting the birthdaydatabase which is a site that allows you search for free for someone's date of birth. The database allows you to enter the first and last name and it gives you the result of that person's date of birth, that way you can identify his age.
Ageism (also spelled agism) is stereotyping and discriminating against individuals or groups on the basis of their age. This may be casual or systematic. The term was coined in 1971 by Robert Neil Butler...