Tea generally has a two year shelf life from wholesaler to retailer extend the teas shelf life

Most large wholesalers now “flush” with inert gas and then vacuum pack in multi-layer high-density bags. As long as the tea remains packaged this way, the shelf life can be up to 20 years.

I think vendors/wholesalers/suppliers/manufacturers should all carry the harvest date information of the tea. Shelf life is a knowledge which tea drinkers have many ways to learn, not necessarily from the vendor. But without harvest date information, shelf life doesn’t mean much.