The trouble is, when someone has worked for 35 or 45 years already and have built up enough on which to live comfortably. How can you motivate them to work longer? Why should they work longer? I live very moderately, frugally perhaps and certainly not in luxury by anyone's standards. No amount of money would encourage me to work.
Retirees paid taxes for decades and continue to pay fuel tax, VAT, Council Tax, road tax, income tax on pension payments, stamp duty etc etc.
They use businesses and keep many workers in employment. Also, it's worth noting, that if retirees did not volunteer in their millions (8.6 million currently) many organisations and charities would cease to function.
Why keep older people in the workplace when so many young people are leaving school with no work?
I don't know how old you are or what kind of work you do @BoldGreenDreamer but I did a manual job all my life and when I came to retire I was knackered. I was an aging woman lifting heavy machinery and working physically all day outdoors in all winds and weathers. I had enough money. I'd had enough work. I could not have carried on. I needed a rest.
We need to live within our means and contribute, but the answer to this is by all expecting less in terms of material wealth, looking after ourselves and the environment better and by investing in the future.