The "elderly have done best in the austerity years" mantra is an important one, because it is likely to be used in the debate over whether all pensioners should carry on getting Winter Fuel Payment and free bus passes -- and, crucially, whether the Triple Lock should continue.
The Triple Lock is the guarantee that the state pension will be raised each year in line with average earnings, inflation or 2.5%, whichever is higher.
The latest ding-dong over this was prompted by official figures showing that while the typical incomes of working households have fallen sharply in real terms during the downturn, retired households have actually enjoyed an increase.
Here are the numbers: retired households up 5.1% between 2008 and 2012, working households down 6.4%. (Note, there's a fall because the income figures are adjusted for inflation or price increases.)
It's a big contrast. However, and weirdly, when this trend is highlighted, there is seldom any mention of how much money pensioners are actually getting -- or how little.
So let's look at some data in yesterday's Family Spending survey, which includes an analysis of the disposable incomes of different households and age groups. Disposable income is what you have after tax and National Insurance are taken off.
Non-retired households with two people received an average of £748 a week last year, retired households with private pensions and some work got £501 and those mainly dependent on the state pension had £295 a week.
The matching numbers for one person households were £336, £285 and £174.
If you look at household disposable income by age, it was nearly £700 a week on average where the homeowner or renter was between 30 and 64 years of age, but £478 for those between 65 and 74.
What's particularly interesting is that income falls with age through the years of retirement years. The figure for households with someone aged 75 and over is just £341 a week.
The reason for the decline is that the older people get, the less likely it is that someone in the house is carrying on with some form of paid work and the more dependent the household becomes on the state pension.
Of course, this is the reason why campaigners for the elderly point out that 1.5 million pensioners live in poverty. And they would say it is one reason for having the Triple Lock.
So the situation is:
*incomes of retired people have been rising faster
*but their incomes are lower to start with
NB Here are the household income tables. A37 and A38 are the relevant ones.