With regard to the second and third hypotheses, the results indicate a direct and positive connection between feelings of loneliness and subjective age; the lonelier the participants, the higher was their subjective age. This finding is also consistent with the literature [19,29]. The size of one’s social network, the satisfaction related to it, and feeling part of the social network have been found to be associated with subjective age [29,70]. Researchers have also found that the connection between loneliness and subjective age is bidirectional. Having a large social network is associated with younger subjective age; older adults who feel younger tend to be friendlier than their cohorts who feel older, and conversely, feeling older than one’s chronological age may limit the desire and capacity for maintaining social relationships, which may reflect compromised physical and emotional well-being [29]. The examination of two variables that might mediate the direct connection between loneliness and subjective age confirmed the effect of malnutrition, but not depressive symptoms.