This chapter examines the moral status of age discrimination by bringing together accounts of the wrongness of discrimination with accounts of the specialness of age (as opposed to, e.g. gender or race). It provides an overview of the main specialness considerations concerning age-based treatment and suggests a taxonomy for different forms of age discrimination. It then relates three influential accounts of the prima facie wrongness of discrimination to this taxonomy. It shows how these accounts differ in their moral assessment of different forms of age discrimination. Finally, it explores different ways in which specialness considerations can affect the prima facie and overall moral status of age-based treatment on these different accounts.