I didn't really want to discuss adoption to my 5-year-old yet

He brought it up, not me. At dinner the other night, he mentioned remembering trick-or-treating when he was little (he's still little!) and that he remembers living with "an old lady and a lot of other kids" and boy, he doesn't know how right he is. He was thinking it was a dream, but we told him he did live with an elderly lady and other kids. I just didn't feel like this was a good time for him to start talking about his previous life as he is only 5 and most likely doesn't understand. He's still in a fantasy land at this age and can't distinguish between fact and fiction very well.