The lifespan of an aluminum strip siding installation can vary, but on average, it is estimated to last between 20 to 40 years. This range is influenced by factors such as the quality of materials, installation techniques, and the environmental conditions the siding is exposed to. Proper maintenance, such as regular cleaning and inspection for damage, can help extend the life of aluminum siding. However, it's important to note that with advancements in materials and coatings, some modern aluminum siding products may offer even longer lifespans.