Construction companies do not have the profit margin to do that, and cities and homebuyers can barely afford construction costs as they are. Construction companies cannot charge much more than they are charging now. The market cannot support that and things start to break down.
There's already a huge infrastructure cost issue in the US. Can they afford more? How much more?
Apparently not then. Expectations of quality of life will have to be adjusted downwards (has already been happening).
Of course, society could stop giving healthcare to people 90+, or 80+, and reallocate some resources from there. It all depends on who has the political power in society, but generally, with a stagnant/decreasing younger age population, the fault lines will increasingly show along various age groups.
Of course, society could stop giving tax breaks to huge corporations, and fund the IRS so that tax revenues are effectively generated. We know who has the political power in society, it has little to do with age demographics.