What is the age range of a twink?

According to the urban dictionary:

The stereotypical twink is 18-22, slender with little or no body hair, often blonde, dresses in club wear even at 10:00 AM, and is not particularly intelligent. A twink is the gay answer to the blonde bimbo cheerleader.
In gay slang, typically that is a young, attractive, stylish male from 15 - 24.