The living arrangements of older people are changing. An analysis of official registration data (1993–1998) in Flanders, Belgium, shows that while the number of single person households has been increasing, the proportion of people aged 75 or more years living alone has been falling and the proportion living with a spouse or partner increasing. No less than one third of the older people who lived alone in 1993 sustain a one-person household into very old age. It was also found that those who are widowed at a very advanced age change house or move very quickly, women to a greater extent and at younger ages than men. The principal destinations are residential care homes and, to a lesser extent, child's households. Living alone appears to be a decreasingly acceptable option. Since very old people with a disability appear to have an increasing preference for residential care and a lessening preference for co-residence with relatives, these developments have consequences for both informal family care and public social services. Particular attention needs to be paid to men who live alone as a risk-group, and residential care provision requires expansion.