Old people living alone: consequences and prevention Important findings in the field of solitary life in old age and the problem of loneliness are presented. Difficulties experienced by old people due to loneliness should not be neglected and their impact on their physical and mental health and general wellbeing needs to be addressed. Therefore some interventions are described that proved to be effective in preventing negative consequences of loneliness among the elderly. As the social network is very important for the health of the old, the most successful interventions are those based on strengthening the social support of old people (for example cooperation within associations, providing support to others, multigenerational households).