Rabbi Shimon Eider Zatzal brings in his Sefer that the Minhag is to put on Tefilin from one to three months before the Bar Mitzva. To the best of knowledge there are three different schools of ...
Why do Chernobyl* chasidim do upsherin at the beginning of the third year? * Including Trink, Skver, etc.
I have noticed more 83 year old men celebrating their second bar mitzvahs, and cannot find any source for this. Is it a new custom? Does it have any basis in pre-20th century practice?