Xhiandra wrote:

Garak being both old enough to be Dukat's rival but Zyal's lover (without the age difference raising eyebrows) and so forth.
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It's possible Cardassians just don't have taboos regarding age difference in relationships, provided both are whatever age is considered legal adult in Cardassian society. Even among humans of today it's common to find relationships where there's 10-20 years between partners.
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It's never stated on-screen (IIRC), but I think we do have to assume Cardassians to have a long lifespan.
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I've always assumed that to be the case.
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That, or the state of Cardassian leadership has merely been retconned for DS9.
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Another distinct possibility.