The lifespan of makeup palettes can vary depending on factors such as formula, usage, and storage. However, as a general guideline, it's recommended to replace eyeshadow palettes every 1-2 years to ensure the best performance and hygiene. Cream-based products may have a shorter lifespan compared to powder-based formulas. Pay attention to any changes in texture, scent, or color, as these can indicate product expiration.