HaLeiVi, when I made the above post I considered adding “Paging HaLeiVi” to it, considering recalling your last comment on this topic to the same effect. (I was secretly hoping you’d see it.)
http://hebrewbooks.org/pdfpager.aspx?req=9147&st=&pgnum=138
The Shach says age 40, YD 246 s.k. 6, as well as the Baer Heitev s.k. 3.