The Cut-Wife claimed to have given Oliver Cromwell succor during the Second Battle of Newbury, which took place in 1644. The scene takes place as backstory several years prior to 1895, making her well over 260 years old.
At 19:50 the Cut-Wife says "By the pricking of my thumbs something wicked this way comes.". The line is from Shakespeare's Macbeth: Act 4, scene 1. "Something Wicked This Way Comes" is a short story by Ray Bradbury, who entitled it in reference to the Macbeth line.
Patti LuPone, who plays The Cut-Wife, played a recurring character in American Horror Story: Coven (2013). Her name is also Joan and the season featured witches as the main storyline.