What is the lifespan of a turbo?

As a keen enthusiast of automotive engineering, I'm particularly fascinated by the intricate workings of turbochargers. Could you elaborate on the typical lifespan of a turbocharger, taking into account various factors such as maintenance schedules, driving habits, and the quality of the components? Is it a component that tends to wear out over time, or can it last for the lifetime of a vehicle with proper care? Additionally, are there any specific signs or symptoms that indicate a turbocharger may be nearing the end of its service life? Understanding the longevity of this critical component would greatly assist in making informed decisions regarding vehicle maintenance and repairs.