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Permeable pavers typically last between 20 and 40 years, depending on the material, installation quality, and how well they’re maintained. Interlocking concrete pavers and stone systems tend to last the longest, especially when built on a properly compacted base. Regular cleaning to prevent joint clogging can significantly extend their lifespan.

The most common causes of sunken pavers are poor base preparation and insufficient compaction. The problem could also be how your pavers were installed. If the soil beneath your patio or walkway wasn't compacted, it will pull pavers down as it settles. Additionally, using bare soil instead of making a paver bed with compacted gravel and sand can cause sinking over time. To fix sunken pavers, consider recompacting the base and addressing any drainage or erosion issues in the area.

The best time to install permeable pavers is during mild, dry weather, usually during spring or early fall. Installing during extreme heat or heavy rain can increase the chance of problems, like poor compaction, shifting, or drainage issues. You should also avoid winter installations in areas where the ground freezes, since frozen soil can prevent proper excavation and base prep. 

Concrete driveways add the most value to your home because they last longer and have a better aesthetic appeal. However, depending on your climate, asphalt may be preferable as it handles freezing temperatures and high heat better than concrete.