A traditional mead can be aged for very long periods, and even if the ABV is not extreme, they tend to be less prone to deterioration from everything I have read (and seen to date). I haven't aged anything long enough to be called "long-aging" yet, as my oldest stuff is about 3 1/2 years old.
However, I have oxidized quite a few things; some intentionally, and some not. If you want long aging I don't think synthetic corks are the answer. They allow the highest oxygen transmission rate of any of the closures in the various wine trials that have been conducted so far (like the AWRI trial). If you age something for several years with a synthetic cork, it will probably wind up smelling like sherry. That may not be bad, and the nutty/sherry smell that a mead develops with oxidation can sometimes be quite nice. But if you don't want it developing an oxidized aroma, I'd pick another closure whether screw tops, crown caps, or my preference, the best quality cork I can get my hands on (with a wax seal).
If you wax seal a synthetic, that would also reduce the oxygen transfer.
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