Now that it's been known that Massive Cremation turned 25 this year, I find that it's also been known that the Ordinary Form of the Mass turned 40 (RSCT to CUAGuy in our combox, and Fr. Loren in his own post).
However, Gregorian Chant has turned 1,100 this century, thus making it still far longer standing than Massive Cremation and the Ordinary Form.
Oh, BTW - there ARE a number of good musical settings in English in the Ordinary Form (People's, Christian Unity, Danish Amen Mass, Community, City). Unfortunately, they seem to take a back seat to Cremation, Jesuits, Celtic, and other similar dreck.