The lifespan of an Adirondack chair depends on its material and maintenance. Wooden chairs can last 10-20 years if properly maintained with regular sealing and staining. Teak and cedar have natural resistance to decay, extending their lifespan. Plastic or HDPE Adirondack chairs are known for their durability and can last 20-30 years, as they resist moisture, fading, and cracking. Composite materials, though durable, may have a slightly shorter lifespan than HDPE. Regular care, such as cleaning and storing during harsh weather, can significantly extend the chair’s life.