The choice of decoration and the personalization of the house has been associated with self-expression and personal identity but also with the enhancement of interpersonal relationships (e.g., Tognoli, 1987; Smith, 1994). A complementary set of studies has shown that consensual ideas about the residents emerge from photos of domestic spaces (Aragonés et al, 2005). The existence of a shared code about the meaning of the personalized spaces presumes that social norms sustain these evaluations. However, the concept of social norms assumes that it is created and shared by a social group (and not by others). In this study we used this theoretical background to show that the bedroom, as an expression of self, allows the inference of the occupant’s attributes. However, as we assume that social norms give consistency to this shared underlying code, we expect these norms to be specially shared by group members. 62 persons participated in this study, 27 being young university students (M=19.04) and 35 elderly from senior universities (M=74.11). Photos of 16 single bedrooms of young and old persons (8 of old persosn and 8 of young persons) were sellected as stimulus for this study, and exhibited to the participants in a PowerPoint presentation. After watching each bedroom, the participants answered some questions on the occupant of the room, namely their sex and age group.. Data analysis was based on the number of accurate responses concerning the age and sex of the occupants of the bedrooms. Young participants were more accurate in the identification of their group’s bedrooms, either in terms of age or in terms of gender. Conversely, older participants were more accurate in the identification of the sex and age of the occupants of rooms of their own age group. This study shows that the meaning of the personalization of the bedrooms are mainly understood inside the same age group. This result confirms previous research on the impression formation about the residents from photos of domestic spaces, but it also calls the attention to the existence and importance of shared social norms inside the same social group.