Were Horcruxes Banned when Riddle was at Hogwarts?

[alanna_526]

No: HPFGUIDX 153874

The title is pretty self-explanitory. I was reading the
essay "Loyalte Me Lie" over at RedHen-Publications the other day
when I came across something rather interesting. She mentions in the
essay that "Horcruxes were a banned subject at Hogwarts more than
twelve years before Dumbledore was Headmaster."

Dumbledore became Headmaster in the school year of 1970/1. (Unless
my dates are messed up.) We know this because Remus Lupin mentions
in Prisoner of Azkaban that Dumbledore became Headmaster the year he
started at Hogwarts, which is why he started at all. Tom Riddle was
born in the year of 1927, and, consequently, started Hogwarts in the
year of 1938/9 and left after the year of 1944/5. (Forgive me if my
dates are a bit off.) If Horcruxes were banned about twelve years
before Albus Dumbledore became Headmaster, they were banned at least
in the year of 1958/9, which is 14 years after Riddle graduated.
More than twelve years leaves a lot of time space in between, but
you have 14 years in which Horcruxes could have been banned that
Riddle was already out of school. If Horcruxes were truly banned at
Hogwarts when Riddle was still in school, wouldn't it have said at
least fifty, or even twenty-five, years before Dumbledore became
Headmaster? I'm just hazarding a guess.

(Slughorn tells Tom that Horcruxes were frowned upon by Dumbledore,
not that they were necessarily banned.)

I'm new, and I don't know if this subject has been exhausted
already, but think about it. JKR has messed up with dates before,
but this is so blatantly obvious it isn't funny. So think about it;
I may be wrong.

alanna