The Mass of Ages

Someone has added a comment on the post about tabernacles asserting that the Mass of Ages is the Ordinary Form of the Mass. Whoever wrote this has preserved his or her anonymity, so we may never know who it is. However, it does seem an odd comment to make, as the novus ordo, now often called the ordinary form, was only promulgated in 1970. Before that date, it did not exist. Prior to 1970, the form of the the Mass celebrated throughout most of the Western Church since the Council of Trent had been the Tridentine Mass. This is essentially the same as as the Mass as it had been celebrated in Rome and most of Italy since the time of St Gregory the Great. How can this contributor claim that that the Ordinary Form, with a history of just 44 years is the Mass of Ages, when the extraordinary form has been about for 400 years and arguably 1400 years.