Why is the Roman Catholic Mass said in Latin?

When Catholicism rapidly spread through the empire back in the first millennium, the only common language that all educated people could read and speak was Latin, it was the common language that all people shared. The Scriptures were translated into Latin and Latin became the official language of the Church and has remained so until this day. One of the best things about this is that since it is no longer a living language, it does not change the frightening pace that modern spoken languages do. For instance, I am 60 years old and the English language that is spoken now in many cases means exactly the opposite of what I grew up with. So the Mass is in Latin as the standard language of the Church and we know what it means, what the words mean, and the theological concepts behind each.