> But as the article said, there is a diminishing amount of value after every year of true experience after a number of years. I would say around 10.

I don't buy it. 10 years is about when you start moving into the actual expert category. Note I said start.

At 35, I finally had real, full control over multiple languages, could pick up CLR and understand and implement any algorithm in it, finally understood exactly why concurrency was so damn hard and how to mitigate that, and would pass practically every interview with flying colors. I could finally drive my tools with some facility and started to realize gdb was my friend.

At 45, I can predict the errors I and others are likely to make and take steps to mitigate them up front--although I still get irritated that I when I make the mistake anyway. My comments are now psychic--my team often remarks how "I just thought that I could really use a comment explaining this-and, behold, there it was". I can reduce interviewers to tears and can surprise all but the most knowledgeable experts in their own domains. I reach for gdb far more often, but am still frustrated at how much I don't know about it.

I still only consider myself an "expert" in very few subdomains--none of them involving programming languages.

One of my heavy hitter software guys once said: "Your code is the most straightforward code I have ever read." I apologized for being so simple. His laughing response: "Don't apologize. That was a compliment, dumbass."