LOL, i love your "statuses are slightly different", there are for most part totally unfair, the 37.5 years stated are the maximum, quite often having children or a various status get you retired at 50 or less.

there is not much rational for it, especially when these pension funds have to be paid by doctors (50% of their pensions payment go to agricultors and SNCF) and private employees who are far from enjoying these quind of outdated status (they are not exhausted anymore at 50).