I'm not sure his argument follows.
". As we've been getting older and older since the 1860s have we been getting poorer and poorer? Is it the case that somehow at the same time, because all these old people were dragging the economy back, we were getting poorer?"
This does not account for the fact that for a huge swathe of time 'since the 1860s', care for the elderly was not publicly funded.
"Britain is expected to move from four to two working people supporting every over-65 year-old.[...]
Ferudi said this move was not historically unprecedented, pointing to 1900 where 14 working people supported every elderly person."
I don't really understand the relevance of this point, so I may have misunderstood it. But it seems to me that the cost of one person's divided by 14 is considerably less costly to the latter than one person's care divided by 3 or 4.
I am NOT saying that care for the elderly is wrong, or anything in that league. But I do think it's naive to pretend that the population shift that my generation will have to deal with is not going to be incredibly costly. As usual, The Economist provides an excellent analysis:
http://www.economist.com/node/13888045