How old does a person have to be to use Birkman® Express?

Birkman International do not permit people under 13 years of age to complete the Birkman Questionnaire. You should also be aware that we expect some change in a person's profile during the years 13-25. However, this change is more usually a matter of degree - some scores become stronger or weaker - rather than of changing from "one of these" to "one of those".