In a manner that is not affected by age; in a way that seems timeless or eternal, not subject to aging.
From 'ageless' (ageless beauty, from 'age' + '-less' meaning without) plus the adverbial suffix '-ly' (from Old English '-lice'). This formation combines multiple English derivational layers.
When we say something is 'agelessly beautiful,' we're actually saying something deep—that it transcends the normal rules of time and decay, which is why the word feels more poetic than 'in an ageless way' would.
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