I didn't say it will only last two years. Some shunts last decades. The takeaway is they don't know when they will fail. Don't live life in fear, know shunt failure symptoms and issues and then live the best life. You can find good shunt info at the Hydrocephalus Association, google them as links are not allowed in newer posts so I can't include it. I know it is scary, finding out more is the best approach. There are lots of reasons people have hydrocephalus, so my experience as a family member is likely to be very different from yours. I've been there for 5 shunt surgeries for a 7yo.