While working on the skill list in my resume I realized I haven't used some of the specific tools or languages in many years. I still know them and I could get back up to speed quickly, but I don't want to pass myself off as an expert either.
For example, the C programming language. It was the first language I learned to program in, but I have hardly used it since I got out of school over 10 years ago. I could get back into it quickly if needed, but if an interviewer asked me a specific question I could look like I don't know what I'm talking about.
Is there a positive way to say that "I was good at this, but now I'm rusty"?