genesis,
Ça ne va pas, non?!
The number of working hours by itself, does not provide you with productivity!
35 hours/week, may be more productive than 60 hours/ week.
Productivity is measured by quantity of output/per hour.

As for the OP question, even though they might have a point, the social system is about to burst and if they want to maintain it for some time longer, they have to do something about it, either cut benefits or increase charges.
By changing the retirement age from 60 to 62, they are doing both as well as reversing their progress towards the European current trends.