Hoi Petra,
Even kijken op www.citizenship.gov.au ; 
Test eligibility
To sit the test you must:
    * be an Australian permanent resident, and
    * satisfy the department of your identity during the process of registering for the test, and
    * allow the department to take a photograph of you or provide one yourself.
The following persons are not required to sit a test:
    * those who lodge their citizenship application before 1 October 2007, or
    * those aged under 18, or
    * those aged 60 and over, or
    * those who suffer from a substantial impairment or loss of hearing, speech or sight, or
    * those who suffer from a permanent physical or mental incapacity which means you are not capable of understanding the nature of  your application, or
    * those who were born to a former Australian citizen, or
    * those who were born in Papua before 16 September 1975 to an Australian citizen born in Australia as currently defined, or
    * persons who are stateless and were born in Australia.
Ireen