This study aims to identify the relation between homeless people's age and behaviour, thus revealing useful behavioural markers. We divided participants in three age groups (20-35, 36-50 and 51-65 years old). The considered variables were: self-image, emotional state, way of relating to the future, group affiliation, alcohol consumption, resort to other social services, formulated complaints, motivation for change, tendency towards dissimulation. Results show that participants aged 20-35 assign responsibility to others and they are more gregarious than participants aged 36-50. Younger participants are more conflictive and older participants have higher tendency towards dissimulation and alcohol consumption.