(1) Background: In a society with an advancing aging rate, medical systems are coming under pressure due to an increasing flow of older patients with multiple somatic diseases, exacerbated by their psychological and sociological backgrounds. We aimed to investigate the relationship between frailty and loneliness in older adults and to provide a holistic perspective on these concepts. Our research question was “Is there a link between the loneliness and frailty in older people?” (2) Methods: To assess the link between loneliness and frailty, we conducted a search accessing Index Medicus and PubMed; the timeframe of our research was from 2013 until 2023. Data regarding the study population, as well as loneliness and frailty assessments and approaches, were extracted. (3) Results: A positive relationship between loneliness and the appearance and progression of frailty in older adults is argued for. (4) Conclusions: Frailty and loneliness in older adults are often interconnected and can have a significant impact on their overall well-being. Early identification of frailty by assessing risk factors (including loneliness and/or social isolation) should become a standard of care for older patients. Appropriate combined interventions that effectively address both frailty and loneliness (physical exercises, psychological support, and social engagement) can promote healthier aging, prevent health deterioration, maintain independence, and reduce healthcare costs.
