买二手房，房龄超过这个年限，真心不建议买！

Core Insights - The article emphasizes the importance of considering the age of second-hand houses when making a purchase decision, suggesting that properties older than 20 to 30 years should generally be avoided due to various issues related to aging and maintenance [1][4]. Group 1: Aging Issues - Properties older than 20 years often face significant aging problems, which can severely impact living quality [1]. - Common issues in older properties include exterior wall cracks, water leakage, and outdated design concepts, which can lead to decreased safety and comfort for residents [2][3]. Group 2: Market Dynamics - The value of older properties is declining as urban renewal policies focus on renovation rather than redevelopment, reducing their financial appeal [2][3]. - The shift from single-school zoning to multi-school zoning has diminished the value of properties previously considered desirable for their school district advantages [3]. Group 3: Financial Considerations - Older properties typically require a higher down payment due to stricter bank evaluations, which assess the risks associated with aging buildings [4]. - The potential for depreciation in value over time makes older properties a less attractive investment compared to newer ones, which are recommended to be between 10 to 15 years old for better value [4].