Man, I don't know what the hell they mean.
I've dreamed about my dead son more times than I can remember. Sometimes they're good dreams, sometimes they're worse that you could imagine. Sometimes he's a kid, sometimes he's grown.
Sometimes I dream random weird stuff that makes no sense. I dreamed my wife got snakebit the other night, she refused to go to the hospital....pretty realistic.
Sometimes my dad is in my dreams. He always middle-aged, and strong. (he's nearly 88 now, and barely walks)
I used to think all this meant something, now I really don't know. The dreams about my son usually torment me, I reckon it's just my subconscious releasing thoughts I don't acknowledge during consciousness.
I've noticed in a lot of my dreams that I'm not 76 years old, but closer to around 40-something or so.
My weirdest dreams are those when I feel like I'm falling from great height. I always wake up before I hit bottom.