This paper examines how and what teachers learn from their older and younger colleagues. Data were gathered from interviews and written reports from 27 Belgian and Finnish teachers. Thematic qualitative analysis was used. The results revealed differences in what teachers learn from older and younger colleagues. Teachers reported learning innovative teaching methods and ICT skills from younger colleagues, whereas practical information, classroom management skills, self-regulation and community building were learned mainly from older colleagues. Attitudes regarding teaching and different ways of being a teacher were learned from both younger and older colleagues alike. Similarities were also found in how teachers learned from their older and younger colleagues. Informal activities and relationships, different forms of mentoring, and working in subject teams or seminars were important sources of learning. An intergenerational learning perspective is important with respect to demographic changes in school staff and in preventing knowledge loss and teacher dropout.