by 
The Curious Bag
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<h4 class="dechead">On One Hand: Light and Heat Can Change It
According to April Sanders on the website Beauty Perfumes, perfume does indeed go bad over time, and for this reason she recommends not keeping a bottle of perfume for any longer than six months. The Scentiments website agrees. Both sources say that light and heat are factors that can change the scent, color, and thickness of perfume.
On the Other: Proper Storage Prevents Problems
Storing perfume in a dry place with a low temperature can help preserve it, according to the Scentiments website and April Sanders of Beauty Perfumes. The latter recommends refrigerating the bottle. She also writes that opaque bottles can help prevent light damage. Sanders says that even if the color has changed, that doesn't mean the odor has.
Bottom Line
Most experts appear to agree that perfume does indeed change for the worse over time. However, if you utilize the storage techniques recommended above, it can last anywhere from 2 to 5 years, which is long enough for most people.
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