In our experience and based on what we know about propylene glycol, vegetable glycerin, and nicotine oxidation, correctly stored e-liquid should be perfectly fine for up to 2 years. Adding an expiration date to a vaping product is down to the discretion of the manufacturer and is not required by law. Having an expiration date helps to determine how old a product may be and doesn't necessarily determine a date in which the product is unsafe to use, as these expiration dates don’t really apply to something as shelf-stable as e-liquid.
Please note: More often than not, it's actually the date of manufacture that's printed on the bottles as opposed to an expiry date. Look out for a factory icon or the words DOM (Date of Manufacture), POD (Produced On Date).
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