It will be marked that I substitute time terms for spatial ones. In fact, I would have the reader see “nine” and “fourteen” as the boundaries – the mirror beaches and rosy rocks – of an enchanted island haunted by those nymphets of mine and surrounded by a vast, misty sea. Between those age limits, are all girl-children mymphets? Of course not. Otherwise, we who are in the know, we lone voyagers, we nympholepts, would have long gone insane. Neither are good looks any criterion; and vulgarity, or at least what a given community terms so, does not necessarily impair certain mysterious characteristics, the fey grace, the elusive, shifty, soul-shattering, insidious charm that separates the nymphet from such coevals of hers as are incomparably more dependent on the spatial world of synchronous phenomena than on that intangible island of entranced time where Lolita plays with her likes.
(Lolita, Vladimir Nabokov)
I know adverb neither is followed by verb and its subject. But there are two nouns after verb: good looks and any criterion. Why is that, and what does this sentnece mean?