What's the Name of That Book??? discussion

This topic is about
That Terrible Halloween Night
SOLVED: Children's/YA
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SOLVED. Childhood Scary Picture Book "I can't tell you what was in that room, but when I came out, I was an old Man." [s]
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It was a picture book, probably not too many words. I believe the plot focused around a child going through a scary or haunted house. I remember distinctly the last section of the book where the boy enters the final room and the author remarks that he can't describe what was in that room, but when he came out, he was an old man (and the last picture is of an old, white mustached man at the backdoor of the house. )