Are the upanishads are a product of the iron age?

The Upanishads are generally considered to have been composed during the later Vedic period, which is often associated with the Iron Age in India, roughly between 800 and 200 BCE. While they reflect the philosophical and spiritual developments of this time, they also incorporate earlier Vedic traditions. Thus, while they emerged during the Iron Age, their roots and influences extend back to the Bronze Age Vedic texts.