Pope Pius V issued a typical edition in 1570. Pope Clement VIII issued the next typical edition in 1604. Urban VIII issued the next typical edition in 1634. Leo XIII issued the next typical edition in 1884. Pope Benedict XV issued the next typical edition in 1920. John XXIII issued the next typical edition in 1962.
Furthermore, the decrees of the SCR were not incorporated in new typical editions but still retained their force. It would be utterly impractical to put the entirety of decrees in new editions. Rules on the amount of beeswax that must be in candles, for example, were not added to the next typical edition.
1570, 1604, 1634, 1884, 1920, 1962
What was the age of the 1569 missal?
What were the changes in 1570, 1604, 1634, 1884, 1920?
What about the 1954 missal, that changed the entire Holy Week celebrations, cut them down to like 1/4 and changed the times?
What about the 1965 missal?
I have read in many places that one could walk into a mass in the 8th century with their 1945 Lasance Missal and would be right at home.