You need to take into account population age and underlying health problems plus have you been to Oz? In terms of housing they have much more space between than we have.
I live in Melbourne. Yes most houses in this country, in fact nearly all, are detached, although there has been a growing trend for many years to having two
'units' on the same block. Apartment blocks are being developed at a massive rate and I see them as future slums. Slums might be too strong a word, but
certainly the Australian tradition of families living on a quarter acre block is disappearing.
The reason I offer for that lengthy description is to assert my point that the virus infection is no more likely to occur in housing close together than in a detached
property if people are observing isolation and social distancing rules.
Australia's aging population ratio has been increasing constantly because of longer life expectancy just like other first world countries, and I doubt that the
percentage is any lower here. In fact , the increasing cost of welfare (age pension) and infrastructure to accommodate the aged has been talked about here
for a long time.
Miles off topic on a football forum, I know, but I think the mods are sensibly allowing for the fact that there isn't any football.