The present study aims to analyze the length of stay of adults and elderly individuals in the “Vida Ativa Melhorando a Saúde” (VAMOS - Active Life Improving Health) program implemented in Primary Health Care (PHC) in Brazil. A total of 106 users (87.7% females) aged 55.42 years (± 12.22) were followed during 12 weeks in four Community Health Centers. Length of stay was analyzed according to socio-demographic variables (sex, age, marital status, level of education, current occupation, family income) and the indicators of VAMOS program effectiveness (physical activity level and food intake). Descriptive statistics, chi-square test, survival analysis applied by the Kaplan-Meier method and multivariate COX regression model were used. A significance level of 5% was adopted in all analyses. The rate of length of stay was 51.9% (n = 55). Marital status was associated with a longer length of stay (p < 0.05). Furthermore, having a partner (OR = 2.11; 95%CI: 1.16 - 3.81) was associated with a longer length of stay in the program. In conclusion, more than half of the adults and elderly individuals remained in the VAMOS Program and length of stay was greater among those with a partner.