Have to hop in with my 2 pennies :-)
There are many boys who never experience a radical change in their voices during puberty. I know, because I was one of them. If I was encouraged to give up singing during this time, I would have been mute from age 12-28! :)
Peter Giles, an authority on the training of countertenors, actually recommends keeping a boy singing (and he's British!) during the change. He believes focussed use of the changing larynx allows the boy to move more gracefully through the changes. Specifically for a countertenor, it allows him to "remember" how to use his "boy" register during the transition.
My speaking voice got lower *very* gradually, and I had my boy soprano extension until I was 22 or so. An alto voice emerged out of that during my mid 20s.
Tako
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