Boomers refusing to retire is why Millenials can't earn money.
Retired people can contribute to their communities, in ways that return psycho-emotional rewards, supporting the real economy and themselves, and reducing waste from consumerist materialism.
Im pretty sure you would decrease wealth, if you force people to retire. The ones who earn a lot also bring the experience on the table. A good example would be a world class physics professor. Should he really be just replaced with some Millennials? Maybe they first should prove themselves…