There’s a very easy answer to why Robin isn’t aged up: the writers don’t want him to be because they need to “finish” OutlawQueen more satisfactorily than the way they did in 5B and in order to do that you can’t have 30ish year old Regina with 60ish old Robin because that’s, in their eyes, unsexy.
Pretty much. And well, there’s always the sleeping curse narrative if they need it.
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