Experience also gives you the kind of skills that don't become obsolete, and which can't be learned in just a couple of years of practice:

- Writing reliable, maintainable and testable code

- Strategies for solving problems that are very large or very difficult

- The ability to interact well with developers, product managers, executives, customers, etc.

- Knowledge of algorithms and other fundamental things in computer science

Being a good software developer is about a lot more than just dealing with the mechanics of the particular software environment you happen to be using today.