Before then, here's a guide to what economists say the evidence tells us — and what it doesn't.Concern about generational disadvantage is not unique to Australia Migration of young people has offset this a little, but health improvements have also meant longer lives and a demographic "bulge" of retirees.The consequences of this were featured in the federal government's first Intergenerational Report, an initiative of then-treasurer Peter Costello, published in 2002."A steadily aging population is likely to continue to place significant pressure on Commonwealth government finances," it read."If policies are not adjusted, the current generation of taxpayers is likely to impose a higher tax burden on the next generation."The prediction has played out. In 1975, there were seven working-age people for every retiree, but today there are four