Here’s the abstract of the introductory article, by Ulrich Mayr:
Decades of cognitive aging research have led to a picture of the aging mind that is primarily characterized by gradual, though relatively broad, cognitive decline across the life span. Until recently, relatively little attention has been devoted to the question of whether there are ways to slow down, if not stop, this decline. With the special section on cognitive plasticity in the aging mind, we respond to what seems to be a beginning of the reversal of this trend (e.g., Kramer & Willis, 2002). In this short introduction, the author provides some context and a preview of the articles that appear in the special section.