this 'rule', thought up by our French friends is ignored on a grand scale by, err. the French themselves. They take little or no notice at all of the rule. Come to think of it they have the same attitude (a healthy one i think!) to many other euro rules also.
Just a shame we brits slavishly obey. A reliable source informs me there are 'thousands' of over sixties in the skies over la belle France. (and good luck to 'em!)