The industry standard says Fiber Optic Cable Lifespan should last 25 years. But ask any veteran network engineer, and they will tell you a different story. The statistics indicate that if installed correctly and under acceptable long term load the lifetime of the fiber is very long (>40 years). Optical Performance Monitoring: Uses tools like Optical Time-Domain Reflectometers (OTDR) to detect faults. The longevity of fiber optic cabling infrastructure has already exceeded 35 years since the first deployments and we expect the average lifetime will be much longer than 35 years based on the materials, technologies, and manufacturing processes used to produce modern, high quality optical fiber and. Effective lifecycle management of fiber optic cables, from selection and installation to daily maintenance and replacement, is essential. This article will explore the three core stages: fiber optic cable selection and installation, usage and maintenance, and aging assessment and replacement. While routers, switches, and transceivers often have upgrade cycles of 3 to 5 years, properly installed and maintained fiber cabling systems can last 15 years or more — spanning multiple hardware generations. Others, installed in the 1990s, are still running.