1. As long as the bottle cap is not opened, perfume has no shelf life, but this is only theoretical. Because it is a consumable after all, it is generally not recommended to keep it all the time and use it before a reasonable time. So what is a reasonable time? Usually 3-5 years after opening. 2. How long is the shelf life of perfume after opening? Generally, it takes 3 to 5 years, and it will be used up within this time after opening the lid. However, some perfume manufacturers will directly indicate the expiration date of the perfume and use it up before this time limit to ensure that its fragrance is most in line with the original version. 3. After the cover of perfume is opened, the fragrance will change with time because of contact with air. The longer it is preserved, the more obvious the change of taste will be. On the contrary, the sooner you use it, the better. However, you should also pay attention to the fact that you can't always use too much perfume, and the right amount is the right way.