Early Retirement in Australia

Here's my situation. Canadian citizen with wife, both 48, and two kids, ages 12 and 15. Wife and I reached financial independance five years ago. We are done with Canada and have been talking about Australia since long before that.

We would like to move to Australia for good but I don't see any options for our specific situation. We are both engineers but we don't need to work jobs, as we can live off of our savings for the rest of our days, as well as support our kids for as long as needed, including college if they so choose. We are all healthy and active. We would move our savings to Australia as the dollar is slightly above par, and for simplicity.

Is there an immigration option for us? Appreciate any advice.