You have quite a few options depending on what Australian visa you would be applying for. The choices are

1. Working Age Parent (Subclass 103) Visa is suitable for a person outside Australia who is not old enough to be granted an Australian age pension and who meets the balance of family test. 
2. Aged Parent (Subclass 804) Visa is suitable for a person in Australia who is old enough to be granted an Australian aged pension and who meets the balance of the family test.
3. Contributory Parent (Subclass 143) Visa is suitable for a person who meets the balance of the family test and is willing to contribute an extra application fee to cover health costs.
4. Remaining Relative (Subclass 115 / 835) Visa is suitable for a person with all relatives settled in Australia.