A developmental study of practical problem solving in adults. 
Previous research indicates that young and middle-aged adults perform better than other age groups on problems similar to those they might encounter in their everyday lives.  However, elderly adults have not performed better than other age groups on problems designed to give them the advantage.  In order to ensure that the problems used in the present study were ones that elderly adults might encounter, elderly adults were recruited to help develop the problems.  The resulting problems were administered to adults between the ages of 20 and 80.  Performance was found to increase from the 20- to 40-year-old age group and decrease thereafter.  Thus, when elderly adults devise practical problems that are intended to give elderly adults the advantage, the elderly adults still perform less well than do middle-aged adults.