She said in the game the substance she uses to make gateways into Limbo was based on an old Wiccan recipe. Heck, the spell the Macbeth witches use has animal ingredients, and that was based on an actual recipe...
Well old would only go back as far as the 1930's and Wiccans don't believe in animal sacrifice hence why don't use animal parts in their rituals. The Witches in Macbeth were using ancient Witchcraft, which is not the same as Wicca.
Hey I'm not sure you still take requests but hear me out on this. What if we had Heihachi and Solid Snake (Both Old) and a few other people (doesn't really matter who) sit down and have a few drinks. Snake asks Heihachi for his special drink for him and himself. When Heihachi brings the special drinks out he and Snake have toast saying something like "To our young age." The other people at the table will be confused and will ask them both "How can you toast to your young age when you're both old?" then after when they both finished their drinks they turn young.
Note that this "Drink" I'm talking about is the same one Heihachi takes in Tekken Tag Tournament 2 so he can stay young.