So, I am 53 years old, a white guy with two engineering degrees, who's been programming for a while now. I still get imposter syndrome, whenever I am on a new project where we're using a new technology. So don't get too hung up on the idea that you're going to get rid of it.

BUT, now that you know (intellectually) that it's a normal mental illusion, it can be disregarded. This doesn't make it stop happening, any more than knowing about the blind spot makes it stop being a blind spot. But, you know not to listen to it, like you know that something disappearing in your blind spot doesn't really mean it's not there.

In fact, I now use it as a metric of whether or not I'm learning enough new tech, or if I'm staying with what I'm comfortable in too much (which is a path towards obsolescence when you're a programmer). When I get feelings that I recognize as Imposter Syndrome, I know (intellectually) that it means I'm working on new knowledge, and that's a good thing. It doesn't make the feelings go away; learning more about the new thing will eventually help with that (temporarily). But intellectually I know I've worked on enough projects to not be an imposter, more or less by definition, and I know that the feelings of "I don't know what I'm doing maybe I'm not cut out for this" are normal, and not an accurate guide to whether or not I am able to do this. They are, of course, an indication that I need to keep working on learning whatever the new thing is.