THOUGHTS FOR THE ENQUIRING MASON From TIME IMMEMORIAL (Freemasons Lodges) - September 2008.
To attempt to answer something in question is best for one to consult a good Dictionary.
The NEW SHORTER OXFORD ENGLISH DICTIONARY (1993): time immemorial Law (since) a time up to the beginning of the reign of Richard I in 1189 CE.
Considering our Freemason’s Lodges can only in some respect reach back to the early 18th century, with vestiges back as far as perhaps the Schaw Statutes of 1598 CE, it would seem we have been rather zealous in our use of the term “Time Immemorial”.