“…• personal characteristics such as old age, a situation which often goes hand in hand with reduced access to mediating social structures 73,88,[101][102][103][104] • Gender: (strong) differences between men and women are not usually found, after controlling for age, marital status, and household composition 28,51,59,105 • Partner and household composition: being without a partner -widowed, divorced, separated, never married -and living alone, or living with children, affects the risk of loneliness 25,51,54,75,82,[106][107][108][109] • Health, including the situation of chronic, long-term or terminal illness 50,59,106,[110][111][112] • Situational restrictions, such as an urban versus rural community of residence 113,114 • The specific characteristics of the older adult's family and non-family relationships: the divorce of a child or long-term illness of the partner • Socio-cultural constraints, the norms and values that regulate the self-definition and role conception of older men or women. Additionally, personal constraints related to the social skills of the person involved -low self-esteem, powerlessness, feelings of rejection, expectations about personal efficacy, self-perceived lack of disclosure to others -and his or her personality characteristics should be taken into account, 58,113,115,116 although to a lesser extent.…”