your edited in link is wrong.The last time the Vatican made a law it was indeed 12 (many, many years ago) but they switched to being in line with Italy a long, long time ago as well and the age of consent there is now 14, regardless of what QI or your bad link says. It is possible to have sex at 13 in VC with permission from parents and if the partner is under 16, but I understand it never happens.
(
LordManley twitter.com/LordManley,
Sun 19 Dec 2010, 18:37,
archived)