Tea experts pointed out that the 150 Pu 'er tea exhibited in Shanghai some time ago has only ornamental value. At present, there is also a lack of accurate research methods for the actual production age of tea. Any food has a shelf life, and so does tea. Pu 'er tea should be 5 to 7 years old. During this fermentation period, the brewed Pu 'er tea tastes mellow and fragrant. The longest storage period of fermentation is 15 to 20 years. ? As a kind of food, it is maintained. According to the staff of the municipal quality inspection department, Pu 'er tea can be divided into two types: raw and cooked, and both raw and popular types have a shelf life of 36 months. Generally, cooked pu has no shelf life and can be stored for more than 10 years. The main producing area of Pu 'er tea is Yunnan Province, and it has only been popular in various places since 10. Because the health department has studied the functions of reducing blood fat, losing weight and resisting cancer of Pu 'er tea, especially the longer it is preserved, the more effective it is, so the price changes quite dramatically. Distinguish between old and new Pu 'er tea because Pu 'er tea can be fermented continuously. The older it is, the more fragrant it will be, and the more expensive it will be. The new Pu 'er tea refers to the newly made Pu 'er tea, which is green in appearance and rich in taste. Old Pu 'er tea refers to Pu 'er tea that has been put in Chen Fangjiu for a long time, because after a long period of post-oxidation, the appearance of tea leaves is purplish red and the white hair turns yellow-brown. For thousands of years, Pu 'er tea has been favored by consumers because of its excellent quality. At the same time, the unique flavor of Pu 'er tea is also related to its natural transformation process. After the cooked Pu 'er tea is processed by a special processing program, it is broken into tea balls of different sizes and shapes, which are naturally dried in the shade. Then according to the transportation requirements, put them into baskets and transport them to other places. Yunnan is located in the frontier of the motherland, and Xishuangbanna is located near Yunnan, with high mountains and dangerous clouds. In ancient times, traffic was extremely difficult, and the transportation of tea depended entirely on caravans and cattle gangs. There was a long delay on the mountain road. In some sections, caravan can only go twice a year, and cowherd can only go once a year. Tea leaves have been bumping on horses' backs and cows' backs for a long time, and the contents are slowly transformed, so that Pu 'er tea has its unique luster and mellow fragrance. Yunnan Pu 'er tea is a kind of tea, which is a sacred product for warming stomach, reducing blood fat, invigorating qi and prolonging life. Yunnan has the oldest tea tree king, which is also the origin of tea. As early as the late Ming and early Qing dynasties to Tongzhi years, the emperor and the royal family advocated drinking Pu 'er tea, which was also the prosperous period of Pu 'er tea. Pu 'er tea is a kind of post-fermented tea, which has the reputation of longevity tea. It is also known as an antique that can be drunk. It can be stored for a long time, and the older it gets, the more fragrant it becomes. About what? I believe that through the explanation of this article, everyone has a good idea about this. It is said that the older Pu 'er tea is, the more fragrant it is. However, Chen also has a fixed age. After that, Pu 'er tea will lose its edible efficacy, which is harmful and useless.