Carrot Cake Murder: A Hannah Swensen Mystery

Everything was going along nicely. My family and I had narrowed down the suspects to a logical two or three people based on their motives, opportunities, and means. And their ages. The crime occurred 25 years ago. Then out of the blue, the character we never even considered because he looked in his 20s (30 tops) turns out to be the culprit. In unison we said, "What!? Was he 12?" There was no attempt to make the character appear age appropriate. (He would have to be somewhere around 45 if he were the perpetrator.) It was frustrating for us, because it was an intriguing mystery. And even the perpetrator made sense--but none of us even considered him because of the glaring age discrepancy. Very disappointing.