Since when? The Latin Mass comes to us in its exact form from the Council of Trent.
The Council was held between 1545 and 1563 in Trent (Trento, Italy). It was the 19th ecumenical council of the Catholic Church.
The essentials of the Mass come from the time of Pope Saint Victor I, AD 189-199.
It is superfluous at this point to say that His First Mass was the Last Supper, 33.