It's not nonsense though is it? It's not denied by individual examples. Either me or your dad. It's cold hard statistical fact that the 65+ cohort isn't, on average, poor any more.
I specifically said I'd like to see concessions based on benefits. I wouldn't like to stitch up your dad. But its a fact that the over 65s, on average, as a cohort, aren't below average any more. Plenty of them are. But as a cohort they aren't. They're the second richest group, after the ones just behind them. It's not just me and my mates, it's the statistical average.
Why should we ALL get a discount, ahead of our (on average) much poorer kids? That's what you have to justify.