I do not know what it is like in Australia, but I find most of the properties sold in retirement villages in the UK are very small. One, or may be two bedrooms and only one living room. The individual rooms being quite small as well.
Our neighbours recently downsized - from one large 4 bedroomed house to another large 4 bedroomed house, but one with a much smaller garden to the acre or more that came with their previous house, and while our garden is just a large suburban garden, it is only the garden getting to much work, or physical disability, limiting our ability to look after it that would lead us to downsize to an urban house the same size as we have atthe moment, but with little or no garden.