Is the apostrophe needed? I was leaning towards yes.

closed as off-topic by Dan Bron, user240918, linguisticturn, Michael Harvey, Andrew Leach Oct 26 '18 at 17:35

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  • You might consider the days still young to be an elliptical version of the days that are still young, but the common expression is the day is still young. This latter version can be abbreviated as the day's still young. So, both of your versions could be correct, but it's likely the second one (with the apostrophe) that you want to use. – Jason Bassford Oct 26 '18 at 19:14

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