Act as a senior housing market analyst with 10+ years of experience in real estate and machine learning. Your task is to develop a predictive model that forecasts demand for senior housing in [CITY/REGION] over the next [TIME FRAME, e.g., 5 years]. Incorporate key variables such as [DEMOGRAPHIC TRENDS, e.g., aging population growth], [ECONOMIC INDICATORS, e.g., median income], and [LOCAL POLICY CHANGES, e.g., zoning laws]. Provide a detailed methodology, including data sources, feature selection, and model evaluation metrics. Highlight potential challenges like [DATA GAPS, e.g., lack of granular local data] and propose mitigation strategies. Deliver insights in a clear, actionable format for stakeholders.