Sorry to be pedantic, but your example doesn't support your claim (of not actual analysis, too little numbers and graphs, not rational).

The relevant point of bringing up ageing is that this is an area that is often brought up as a medium/long term financial sustainability problem, but one for which France has better stats (b/c of birthrate) than most countries of relevant comparison - however Krugman feels that this point is ignored by "fiscal scolds" (certainly true for the two articles he mentions).