[jlj]

Why can't they provide value any longer?

I feel that it is very easy to get trapped in the mindset that I am owed something based on my prior experience. Reluctance to think beyond past experience, fear of leaving behind what I worked hard to learn, or fear of failure in a new area are all things that have held me back in my own life.

I would disagree that people can not provide value beyond what they did before. Except in cases of physical or mental disability, it's more likely a self-imposed barrier.