The lifespan of aluminum siding or cladding typically ranges from 20 to 50 years, depending on the quality of the material, installation, and environmental conditions. High-quality aluminum siding, when properly maintained and installed, can last up to 50 years. It is resistant to rust and decay, making it a durable choice for exterior cladding. However, factors such as extreme weather conditions, poor installation, and lack of maintenance can reduce its lifespan.