Older adults may be the world's fastest growing demographic. Yet they remain vulnerable to biases and barriers that would be intolerable if directed at others. Such an indictment puts the onus on deconstructing the idea of ageism in terms of what it means ("a riddle"), how it works ("a mystery"), why it persists ("an enigma"), and what can be done about it ("a puzzle"). Reference to ageism must go beyond the idea of a "bug" in the system. Rather,...