Generally in software 5 years are measurable as a geological era. Say you've been on the cutting edge of the technology for 25 years, deep enough to write technical content and build stuff. How would you communicate this to younger peers, including a special kind of younger peer like a son? A son can, in theory, emulate his father and even exceed him. To deal with change, the only thing that matters is the ability to understand (or just guess) the mechanics of change and predict what could happen. Over the years, though, in absence of maintenance the brain is encrusted and fresh energy from youngsters is the only remedy. So I went back to school and learned a few things from my tech son. So in the end, it happens that a father can, in theory, emulate his son and maybe exceed him!