Retrieval of famous names on a Rebus Riddle task by middle-aged and older subjects

This study compared the performances of 20 middle-aged and 20 older subjects on a Rebus Riddle task that required they retrieve the names of famous persons. Older subjects solved significantly more riddles and responded to prompts designed to aid riddle-solving efforts with significantly greater success than middle-aged subjects. Older subjects also had nonsignificantly faster riddle-solving times than middle-aged subjects. Similar riddles were difficult or easy for both groups. Superior performance of the older group appeared to be related to the age of the subject at the time the persons in the riddles had become famous.