The headstones for Norma and Norman indicate that Norman was 20 when Norma died, but later, Emma reads an article about Norma's death that correctly lists Norman's age as 18. See more
Even though she wasn't there, except in his mind. She was dead, but what did that matter? How different is that from any relationship? How much do we project onto our mates? And why the hell do we need so much anyways? Is happiness, in a sense, all just a creation of the mind?