Your best people are not leaving because of the salary. They are leaving because they feel unseen, unsupported, and out of road. And the 2025 data makes that clearer than ever. This article breaks down why mentoring is the most effective answer to the retention crisis companies are quietly facing right now. From the numbers behind why people leave, to what good mentoring actually looks like in practice, to why women in particular are being underserved by most organisations, it is a practical, honest read for any HR or People leader who is tired of losing good people and ready to do something about it. The research is compelling. The cost of doing nothing is significant. And the solution is more straightforward than most companies think.