For older persons, age discrimination can undermine equal participation in modern service and consumer societies. One way to tackle age discrimination is to implement anti-discrimination policy and legislation. However, age discrimination is an ambiguous concept that can be interpreted in different ways and differences in the interpretation can impact the scope and application of related policy and legislation. Hence, to understand how policy, legislation and their central constructs operate within society, it is necessary to look beyond the letter of the law or policy text and explore the interpretations of age discrimination employed by actors in the field. We interviewed experts from Austria and Ireland, who by virtue of their professional or representative position co-structure the conditions for people to claim they have experienced age discrimination. Based on 12 expert interviews and two focus groups, each involving six representatives of the major national advocacy and interest organisations on ageing, we reconstructed four interpretation patterns of age discrimination: age discrimination as the ‘denial of dignity’, as the ‘denial of recognition of contribution’, as the ‘denial of participation’ and as the ‘lack of consideration of need’. The findings are discussed with reference to the concepts of recognition and representation, and considerations are provided on possible legal and political implications of this research.