While textiles are a twice neglected area due to decay and some cultural biases the flax age wouldn't be remotely the right naming convention. The invention age naming convention would imply when they /first used it widespread/. So a few meteoric iron artifacts in the Bronze Age wouldn't make it Iron Age but iron becoming commonplace in tools and weapons would. Similarly if we kept up metalic conventions medieval aluminium wouldn't count but 19th century when they started enmasse refining could be an "Aluminium Age" if not for the fact we know enough from records that it would be redundant.
Calling it the Flax Age would be like calling Prebellum Southern US "the cotton age" - it was used already for thousand of years in several prior ages!
We probably can't trace it that precisely from lack of evidence but a Flax Age would probably be among the Neolithic ages and certainly not the Iron Age.
Calling it the Flax Age would be like calling Prebellum Southern US "the cotton age" - it was used already for thousand of years in several prior ages!
We probably can't trace it that precisely from lack of evidence but a Flax Age would probably be among the Neolithic ages and certainly not the Iron Age.