Fiber optic cables have a long lifespan and can last up to 25 years or more with proper maintenance. The high-quality materials used in their construction make them resistant to corrosion, extreme temperatures, and wear and tear, allowing them to maintain their performance over a. 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. According to industry standards, well-installed fiber cables can endure upwards of 25 to 30 years, if not longer, under. The average lifespan of a fiber cable can vary depending on the type of cable, environmental conditions, and usage patterns.