As people reach their mid-80s, knee health often becomes a central concern due to conditions such as osteoarthritis, joint stiffness, and chronic pain. Choosing the right far infrared knee support can significantly improve comfort, mobility, and overall quality of life for elderly users. This article explores how seniors, especially those aged 85 and older, can select safe and effective far infrared knee braces. It reviews the science of far infrared therapy, explains how gentle heat penetrates deep into tissues, and highlights the benefits for circulation, pain reduction, and flexibility. Practical selection tips are provided, covering aspects like adjustable sizing, lightweight materials, ease of use, and safety features to prevent overheating. In addition, we discuss the differences between standard heating supports and advanced far infrared models, helping families and caregivers make informed decisions. Clinical insights and user feedback are included to show real-world outcomes in older adults. By the end, readers will understand how to choose a knee support that balances therapeutic relief with daily usability, empowering seniors to stay active and independent even at 85 and beyond.