Final answer:
The lifespan of a mattress and its foundation can vary, but on average, they can last around 8-10 years.
Step-by-step explanation:
The lifespan of a mattress and its foundation can vary depending on various factors such as the quality of materials used, the usage, and maintenance. On average, a mattress and its foundation can last around 8-10 years. However, this lifespan can be shorter or longer based on individual circumstances.