A correlation to this is "I've been doing this for 20 (or 25, or 30, whatever) years..." whenever someone is trying to establish themselves as a position of aut

A correlation to this is "I've been doing this for 20 (or 25, or 30, whatever) years..." whenever someone is trying to establish themselves as a position of authority, My standard response is a knee-jerk: "You can be bad at something for 20 years, it's not something you should point out, though." It's fine if you are having a discussion and some context is helpful, such as, "I've been selling residential real estate in the area for about 20 years" as opposed to "Why would I need to protect against SQL injection? I've been working with databases for 20 years and it's never been a problem."