Granite headstones are known for their exceptional durability and longevity. Under normal conditions, a granite headstone can last for centuries—often 100 years or more—without significant deterioration.

Granite is resistant to weathering, erosion, and damage from natural elements like rain, wind, and temperature fluctuations. The polished surface of a granite headstone helps protect it from wear, while the material's density and hardness ensure that inscriptions and engravings remain legible over time.

However, the lifespan of a granite headstone can also be influenced by factors such as:

1. Location and Climate: Extreme climates with frequent freeze-thaw cycles can cause some wear over time, though granite is generally very resistant to this.

2. Maintenance: Regular cleaning and care can help preserve the appearance and condition of the headstone. Neglect can lead to moss or lichen growth, which might require more intensive cleaning to remove.

3. Quality of the Granite: Higher-quality granite, which is denser and more uniform, will generally last longer and maintain its appearance better than lower-grade options.

Overall, granite is one of the best materials for headstones due to its ability to endure the elements and retain its beauty for generations.