This dissertation approaches the marketing of generations. The recent alterations in the structure and population dynamics in Brazil point out the necessity of better characterisation of its age segments. For marketing, a relevant question is to understand how this population will age in respect to its habits of consumption. Observing this process from the perspective of cohorts can bring light to the understanding of consumption behaviours, as this point of view is based on values sedimented in determined time of the cycle of life of the consumers. Knowing such values may favor better evaluation of product and service Marketing-mixes for each cohort and, over all, improve implementation of communication and market penetration strategies. In the aging process three main effects interact: cohort, age and period. The nostalgic trend also intervenes in the process, especially in the manifestation of the cohort effect. The results of this research support the supposition that nostalgia is a psicografic or life-style characteristic. There had not been found indications that relate nostalgia to the age effect. The results point that the nostalgic trend seems to experience remarkable influences from sex and social class (or income level). The influence of the cohort effect, in accordance with classification of the Brazilian population proposed by Motta, Rossi and Schewe (1999), on the nostalgic trend also seems relevant; even so, the data point effect of lesser intensity when compared with those of sex and social class. The results suggest that the cohort effect is relevant in the effort of better understanding consumers attitudes. Employing classification of the Brazilian population in 6 cohorts, several values related to consumers attitudes had been tested and generic Marketing-based approaching guidelines to such age-segments were proposed.