They could make early retirement a lot easier - but that would cost money !
To be fair my place has been flooded with retirements over the last year, many of these being people who weren’t planning to go for a couple of further years. Obviously in their cases they were able to make the sums add up.
This is one reason why the industry is going to struggle to be able to return to early 2020 levels of services in the immediate future, were they to be needed. Look at today’s Met Line forced closure as an example.