In “Two Kinds” by Amy Tan, when the age of Old Lady Chong, the piano teacher's mother, is being describe, the author uses two similes she smells "like a baby that done something in his pants” and has skin "like an old peach".
Most likely its describing Old Lady Chong"s finger. "Like a dead person, like an old peach I once found in the back of the refrigerator. It should be touch since its describing Old lady Chongs age.