The source provides an extensive guide for non-EU citizens considering retirement in Spain, outlining the country's appeal through its lower cost of living and favorable climate compared to Northern Europe or the U.S. It emphasizes that the required retirement nest egg is not a single number but depends heavily on lifestyle and location, offering scenarios ranging from frugal (€600,000 for a couple) to luxury (€1.5 million+). The episode details crucial financial and legal requirements, focusing on the Non-Lucrative Visa (NLV), which demands proof of significant annual income (€28,800 minimum) and savings. Furthermore, it breaks down the varied monthly living costs across Spain, illustrating how regions like Galicia are far more affordable than cities like Madrid or Barcelona, and concludes with a step-by-step action plan for future retirees.