Title: Mass of Paul VI
Content:  of the vernacular, and requested confirmation of this choice from Rome. In response, from 1964 onwards, a series of documents from Rome granted general authorization for steadily greater proportions of the Mass to be said in the vernacular. By the time the revised Missal was published in 1970, priests were no longer obliged to use Latin in any part of the Mass. Today, a majority of Masses are celebrated in the language of the people, though Latin is still used in some places on a regular basis. The rule on the language to be used is as follows: "Mass is celebrated either 
Title: St. Hilary Roman Catholic Church
Content:  Mass was said in Latin until around 1964, when Vatican II's directives came into effect.
Title: Latin Mass
Content:  Historically speaking, "Latin Mass" can be applied also to the various forms of Pre-Tridentine Mass from about the year 190 of Pope Victor, when the Church in Rome changed from Greek to Latin. Latin liturgical rites other than the Roman Rite have employed Latin, and in some cases continue to do so. These include the Ambrosian Rite and the Mozarabic Rite. Some priests and communities continue to use non-Roman-Rite liturgies that have been generally abandoned, such as the Carmelite Rite and the Dominican Rite, celebrating them in Latin. Celebration in Latin of such rites is sometimes referred to as "Latin Mass".
Title: Criticism of the Catholic Church
Content:  After the reforms known outside the church for the Tridentine Mass, said mostly in Latin with a few sentences in Ancient Greek and Hebrew. Since 1970, the Mass has been celebrated in the local language of where it is celebrated, and the Mass in Latin less frequently. A minority of Roman Catholics however prefer the Mass to be celebrated in Latin, and prefer not to use the Mass of Paul VI. In 2007 Pope Benedict XVI loosened some restrictions on use of the Latin Mass with the aim of healing the rift that had come about between advocates of the Novus Ordo Mass and advocates of 
Title: Latin
Content:   The largest organisation that retains Latin in official and quasi-official contexts is the Catholic Church. The Catholic Church required that Mass be carried out in Latin until the Second Vatican Council of 1962–1965, which permitted the use of the vernacular. Latin remains the language of the Roman Rite. The Tridentine Mass (also known as the Extraordinary Form or Traditional Latin Mass) is celebrated in Latin. Although the Mass of Paul VI (also known as the Ordinary Form or the Novus Ordo) is usually celebrated in the local vernacular language, it can be and often is said in Latin, in part or in whole, especially at multilingual gatherings. It is the official language of the Holy See, the primary language of 
Title: Latin Mass
Content:  The Second Vatican Council document Sacrosanctum Concilium authorized the bishops to use the vernacular more in the mass and in administering sacraments and sacramentals. Until 1965, with some exceptions, Latin was the sole language used in the Roman Rite Mass. Celebrants are allowed to use Latin celebrating the Mass of Paul VI. The term "Latin Mass" is sometimes applied to such celebrations, which in some places are part of the normal schedule. Neither the Second Vatican Council nor the subsequent revision of the Roman Missal abolished Latin as the liturgical language of the Roman Rite: the text of the Roman Missal, on which translations into vernacular languages are to be based, continues to be in Latin. In practice Latin has fallen out of use in local churches. A small percentage of liturgies are celebrated (either entirely or partially) in Latin and most seminaries do not require those wishing to enter the priesthood to study the language.
Title: Latin Mass
Content:  concepts of "Tridentine Mass" and "Latin Mass" was brought about by the 1964 Instruction on implementing the Constitution on Sacred Liturgy of the Second Vatican Council, which laid down that "normally the epistle and gospel from the Mass of the day shall be read in the vernacular". Episcopal conferences were to decide, with the consent of the Holy See, what other parts, if any, of the Mass were to be celebrated in the vernacular. Permissions were thus granted from 1967 onwards to celebrate most of the Tridentine Mass in vernacular languages, including the Canon. Following the apostolic letter Summorum Pontificum in 2007, the term "Latin Mass" or "Traditional Latin Mass" has often been used to refer to the Tridentine (or Extraordinary) form of the Roman Rite mass, which is celebrated exclusively in Latin.
Title: Latin Mass
Content:  The term "Latin Mass" is frequently used to denote the Tridentine Mass, that is, the Roman Rite liturgy of the Mass celebrated in Latin and in accordance with the successive editions of the Roman Missal published between 1570 and 1962. In most countries, the Tridentine Mass was celebrated only in Latin. However, there are exceptions. In early seventeenth century China, Jesuit missionaries secured permission from Pope Paul V to celebrate the Catholic Mass in Chinese, part of an effort to adapt their work to Chinese cultural norms and conditions. In Dalmatia and parts of Istria, the liturgy was celebrated in Church Slavonic, and authorization for use of this language was extended to some other Slavic regions between 1886 and 1935. There, "Tridentine Mass" was not synonymous with "Latin Mass". A further distancing between 
Title: Pre-Tridentine Mass
Content:  It is unclear when the language of the celebration changed from Greek to Latin. Pope Victor I (190–202), may have been the first to use Latin in the liturgy in Rome. Others think Latin was finally adopted nearly a century later. The change was probably gradual, with both languages being used for a while. Before the pontificate of Pope Gregory I (590–604), the Roman Mass rite underwent many changes, including a "complete recasting of the Canon" (a term that in this context means the Anaphora or Eucharistic Prayer), the number of Scripture readings was reduced, the prayers of the faithful were omitted (leaving, however, the "Oremus" that once introduced them), the kiss of peace was moved to after the Consecration, and there was a growing tendency to 
Title: Sacred language
Content:  extensively on a regular basis during the Papal Mass, which has not been celebrated for some time. By the reign of Pope Damasus I, the continuous use of Greek in the Roman Liturgy had come to be replaced in part by Latin. Gradually, the Roman Liturgy took on more and more Latin until, generally, only a few words of Hebrew and Greek remained. The adoption of Latin was further fostered when the Vetus Latina (old Latin) version of the Bible was edited and parts retranslated from the original Hebrew and Greek by Saint Jerome in his Vulgate. Latin continued as the Western Church's language 

Question: when did they stop saying mass in latin?
Answer: from 1967 onwards.
1967.