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Not a silly question at all.
An electrolytic will degrade if left unused, but can be brought back by "re-forming" it - slowly increasing voltage across the cap until the specified working voltage is reached.
A decades-old electrolytic has a good chance of being dried out, whether it was used or not. Re-forming won't bring those back. If I were to find an old kit and build it, I doubt I'd use any electrolytics or paper caps in it.
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