506 unselected, previously untreated patients with Hodgkin's disease were treated at the Finsen Institute between 1969 and 1983. The prognostic significance of age, sex, stage, systemic symptoms, histologic subtype, number of involved nodal regions, total tumour burden (peripheral + intrathoracic nodal tumour burden, intraabdominal nodal tumour burden, and number of involved extranodal sites), pretreatment ESR, lymphocytopenia, and treatment modality were examined in multivariate analyses. The only factors of independent prognostic significance for disease-free survival proved to be treatment modality, stage, and total tumour burden, whereas age had no prognostic significance. With regard to death from Hodgkin's disease only age and total tumour burden had independent significance. The significance of age would seem to stem from the fact that some older patients could not be given adequate treatment for relapse. The present study indicates that Hodgkin's disease in older patients is not prognostically very different from Hodgkin's disease in younger patients.