How can you migrate to Australia if you are over 45 years old?

My step dad and are family want to migrate from the uk to Australia but him and my mum are over 45. He is a jeweller by trade and has two sons from previous marriages living in australia. How could we apply for a visa?

_-_-_-_:
I found this site to be helpful, and very interesting. It will give you an answer immediately. Hope it helps, good luck. http://www.immi.gov.au/immigration.htm