The short answer is, yes. Main ingredients in a candle are the wax, fragrance, wick. All these factors combined impact how a candle ages. Although you won't notice it like you would in your favorite foods or beauty products, small changes will be apparent as the candle ages over a 12–18-month period. When a candle is left in light (especially artificial light), the properties being to change. The other primary reason for noticeable changes is dust. By keeping the dust cover or lid on the jar, and in a preferably dark space, you will extend its life and be able to enjoy it longer. Otherwise, the lifespan is 3-4 months.
Signs That Your Candle Has Expired
There are several ways to tell if your candle is nearing its expiration. Is the color changing? Has the scent started to wear off? Does it look especially dry? If any of these things are happening, it's time to "use it or lose it"! Of course, it's fine to burn for ambiance but don't expect the aroma to fill your space. And if its dusty, take a dry cloth and wipe it off to avoid risk of fire.
How to Properly Store Your Candle
Storing your candle in a dark space, with the lid or dust cover on, in a temperature of 65-75 degrees should help you preserve your favorite candle for many months to come.
How to Keep Your Candle in the Best Condition
Trim those wicks! Before each lighting, the wick should be about 1/4" high; any higher and the flame will be out of control, it will burn too hot, and you may see some soot. Each burn should be no longer than 4 hours, EXCEPT the first burn, which should be left to burn until the melt pool reaches all sides. By extinguishing it beforehand, you risk tunneling. Tunneling is when the wax builds up on the sides of the jar - which reduces its life. If you do experience tunneling, cover the opening with foil, then cut a hole in the top. Light the candle and let it burn until it evens itself out.