That’s an interesting question which I haven’t applied my mind to.
Off the top of my head:
1. A tax on assets that would ordinarily compel people over 70 to dispose of them at a certain point
2. Reducing the state pension linked to those assets on a sliding scale.
3. Massively taxing second homes.
4. Banning people over a certain age from driving so they will need to move to more accessible by public transport, smaller homes.
5. Taxing pension income higher above a certain threshold
Thing is, whatever you do with society, and the tax structure within it, it will be held as unfair by some, because life is unfair, as anyone sleeping rough tonight will attest. It’s surely got to be about a structure that is fair to the most people.
Any the current system plainly isn’t.