This article is about blades that are actually 25 years old and being replaced. The video is testing is to ensure new blades can handle both peak stresses in the static test and less stressful cyclical loading for 25 years. So, 25 years from now those blades will also reach the end of their service life and need to be replaced.

That said monitoring and inspection can maximize the lifespan of individual turbines even if nobody is aiming for 50+ year service life.