As people age, the prevalence of frailty, multimorbidity, and polypharmacy increases, presenting significant challenges in geriatric medicine. These three elements are interrelated in a bidirectional manner, forming what can be termed the "geriatric triangle." The complexity of their interconnections means that addressing each issue in isolation is insufficient for achieving an effective resolution. Thus, a comprehensive understanding of this geriatric triangle is essential for appropriate geriatric management. This review aims to illuminate the relationships within the geriatric triangle and to offer insights into potential strategies for managing these interconnected challenges. Geriatr Gerontol Int 2025; 25: 657-662.