The Prime Minister will send a message of congratulations to people turning 90 years of age or more.
The Queen and Governor-General will send a message on a 100th birthday.
On request, the Prime Minister and the Governor-General will write again every year and The Queen will write again every five years.
The Prime Minister and Governor-General send messages to couples celebrating 50 years of marriage and subsequent wedding anniversaries.
The Queen sends messages to couples celebrating 60 years of marriage and will write every five years after that on request.
A Statutory Declaration can be made by downloading and completing this form.