Retirement Preparation Programs (RPPs) aim to challenge stereotypes about the aging process and promote assertive decision-making among pre-retirees, recognizing that developing resources for well-being is essential. This chapter aims to present a model and its effectiveness of an RPP based on the Conservation of Resources Theory, using a fictitious case. The program was adapted and structured in six sessions combining speeches and dynamics. Assessment was conducted at three time points (before the intervention, immediately after, and two and a half months post-intervention) in two real groups. The experimental group consisted of ten pre-retirees with a mean age of 58.1 years (SD = 4.4), mostly women, while the control group included 13 participants with similar sociodemographic characteristics. Significant differences were observed in the Perception of Future Retirement and Subjective Happiness in the experimental group. Finally, the chapter discusses limitations and possibilities for application in other contexts, presenting a Retirement Resource Inventory and other evaluative instruments to guide interventions such as the one described in this chapter.