The present study is based on a 10-year observation of the completely competent elderly people aged 69-71 years in 1976, living at home. The purpose of the study is to identify predictors of incompetence in ADL at the follow-up carried out 10 years later. Among all the items of ADL, i.e., walking, eating, toileting, bathing, and dressing, the most remarkable decline was found in walking. The incompetent, those who suffered loss of independence on one or more items of ADL at follow-up, accouned for 32.4% of men and 25.6% of women. In the univariate logistic regression analysis, low levels of social activities in both sexes, history of hypertension and ECG abnormalities in men, and overweight and anxiety about present health status in women had a significant relationship to incompetence in ADL. The significance of social activities for both sexes was still observed in the multivariate analysis.