While the Type MLS is rated to withstand a load life test of 10,000 hours at 85°C with ripple current that would cause the core temperature to be 125°C, shown here is an actual life test for 13,000 hours at 125°C. The ESR has stopped increasing and the capacitance is not changing. It looks like it is good for many thousands of more hours. Based on expected life doubling for each 10°C that the temperature lowered, 13,000 hours at 125°C demonstrates an expected life of 95 years at 65°C. That supports the MLS datasheet claim of 100 years expected life.