An ages-old bank problem

We each applied to our bank for Cartes Visa Classic Facelia, advertised as being available to “all clients in possession of a current account, in their sole name or jointly, who are over the age of 18”.

I was turned down because I was over 65 (I turned 66 in December). My wife was accepted as she is still 65.

Everything I can find online about age discrimination in France relates to employment. I assume the age cut-off has something to do with insurance?

Is there any mileage in arguing age discrimination, or that it has been advertised as open to over-18s?

Des Murphy, Aude