Interesting question.
I read somewhere that most people dream in color. So when you have a dream in black and white, it’s supposed to have more significance.
I’ve also read that older generations that grew up without color television, tend to dream in black and white. But that correlation doesn’t sound like causation to me. Like what about the generations before television existed at all?
Since vision is both physical and neurological, I wonder if the processing of color changes with age?