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What are the most important features to update in an old bathroom?

When updating an old bathroom, it's essential to focus on key features like plumbing, ensuring all pipes and fittings are modern and functional to prevent leaks. Update the ventilation system to prevent mold and improve air quality. Consider replacing old toilets, faucets, and showerheads with water-efficient models to conserve water. Upgrade the lighting to LED fixtures for better energy efficiency. Refresh the walls with moisture-resistant paint or tiles to prevent mold growth. Installing a new vanity and sink can modernize the look and increase functionality. Replace outdated flooring with water-resistant materials like ceramic tile or vinyl. Finally, consider upgrading to a modern bathtub or shower to enhance comfort and aesthetics.