Mid 30s. I'm thinking of someone in particular for that who taught me a lot of stuff that really improved my process and code cleanliness. At the time I felt

Mid 30s. I'm thinking of someone in particular for that who taught me a lot of stuff that really improved my process and code cleanliness. At the time I felt like I was really hot stuff because I was hired as a "junior programmer" but was managing all the code across a few languages for an entire tech-based company. He was hired after the company hired half a dozen other programmers and he really helped all of us improve our skills in just a couple months. He then quit because the company wasn't taking his advice, and went back to freelancing. (Advice that 2 entire programming teams agreed on at that time.) There was one programmer in his mid-20s that many co-workers thought was amazing, but I thought he was full of himself and produced overly complicated work that even he had trouble fixing and those around him found impossible. Below that, I know of programmers who are very quick to learn things but just don't have the raw experience to really take care of things on their own yet.