Pu 'er tea will naturally ferment when stored, so it will produce different flavors at different stages. The best tasting period of raw tea in suitable environment is 10 to 25 years, and that of cooked tea is 8 to 15 years. However, if it is not properly preserved, Pu 'er tea leaves may become moldy.
Precautions:
Although Pu 'er tea has a good reputation, drinking Pu 'er tea must be scientific. Tea with the best shelf life will not only oxidize and decompose beneficial components, but also cause mildew. When green or yellow appears on tea, it shows that a large number of Aspergillus flavus have been produced in tea. Drinking at this time will be harmful to health and should be stopped immediately and discarded.
Refer to the above content: People's Network-Pu 'er tea is not as old as possible: the shelf life is about ten years, and it is easy to get moldy if it is stored improperly.