Pension is very complicated here, there are so many different systems depending on who you worked for. I think is was said there are at least 30 odd.
This is why Macron wanted to change it to a more equal system and says if you have worked it counts towards your pension which isn’t the case at the moment.
At the moment the year is divided into quarters , and you have to have earnt a certain sum, for it to be counted in. The sum of all the these are added and with other things taken into account, the pension is calculated.
There so many abnormalities depending who you have worked for, making huge pension inequalities.
If, the wage was too low it isn’t counted in as worked on the pension system. This is certainly the case of students working in the holidays and seasonal workers.
or
Teachers working in private schools could get less than government run ones, the average of the 25 years of your working life against the government ones taking your 12 best years.
Other government workers, are for the last six months of work, put on a higher wage which is counted as the base of their pension instead of the 25 years.
Railway workers can retire early, a throwback from shoveling coal but they don’t want to relinquish now etc etc
It is all very complicated not at all straight forward like in the UK.
The French Social Security System III - Retirement - Cleisshttps://www.cleiss.fr