I find it hard to believe that early retirements can be attacked as being "inefficient" in the same way the shorter workweek has been. Does anyone really believe that 60 year olds are as productive as 30 year olds in the pure capitalist sense?
That's the good old (1830s) liberal prerequisite to have a work market.
See Polanyi and the end of Speenhamland laws... Un roi sans divertissement est un homme plein de misères