What I am saying is that if you reject an offer by the company for RA65 now you can’t later claim the company is in breach of age discrimination laws. The offer was made and you rejected it.
Sorry, but I believe this to be incorrect to a degree. Any contract, regardless of whether or not it was agreed by all, can't go contrary to the law. Signing a contract with age 55 doesn't mean anything if it's deemed discriminatory in the eyes of the law. It has already been ruled that age 60 is the normal retirement age for pilots in Canada, so you could have a case for age 60, but maybe not for age 65.