The study focuses on pupils’ aggression towards teachers. The goal of the study was to determine a statistically significant relationship between the forms of aggressive behaviour and the age of teachers and the length of their teaching experience. The research sample consisted of 268 teachers of elementary schools, secondary vocational schools and grammar schools in the region of Banská Bystrica. Results revealed a statistically significant negative relationship between teachers’ age and the years of teaching experience in three forms of aggressive behaviour: refusal to obey instructions, intentional disruption and ironic remarks. A statistically significant relationship was observed between the length of teachers’ teaching experience and destruction of school property.