Both Worlds at Once is a study of works of art conceived and produced late in their creators' careers. It pronounces an alternative to the mainstream life span creativity research which has, in general, adopted a decline perspective to the fruits of old age. Amir Cohen-Shalev argues that this age-decrement approach misses what the artists themselves tried to do in old age, which is often to develop a new form that allows them to thrive on ambivalence. Against the bleak predictions of developmental psychology and folk wisdom, this book focuses on old age as a unique stage of creative activity.