I wrote to my first counselor 20 years after the fact. I hadn't known how to contact her prior as there was no Facebook or anything when we parted. I wrote her to thank her for her life-changing influence and about my progress in big-picture things- working on my degree, motherhood, etc. She sent me a lovely reply, just a paragraph or two I think, telling me how well she remembered me and complimenting me and it absolutely made my week.