If you know an older Australian who has a special wedding anniversary or birthday coming up, you can ask the Prime Minister of Australia to say, 'Congratulations!'
It might be a 50th wedding anniversary or a 90th birthday. The Prime Minister will send a special message of congratulations to them on request.
In some cases, The Queen and the Governor-General will send their best wishes too.
Click here to see if you or your loved ones qualify for a special message.