The metaphor for aging that William Shakespeare used in his Sonnet LXXIII was the expression "ashes of his youth".
It is a rhetorical figure under which a reality or concept is expressed through a different reality or concept with what is represented that has a certain relationship of similarity.
Knowing that there are various types of metaphors, where the common ones are found, the synesthetic ones, among others, it can be said that "ashes of his youth" is a prepositional complement metaphor because there is a real image (ashes) that is linked to the unreal one. (youth) through a proposition (of)
Aging or old age in this case is imagined as the result of a process where youth is burned in its entirety and the residue is ashes.
The metaphorical expression is attributed to the fact that ashes of any material is possible, but not of something intangible such as a stage in the life of the human being, that is, it is something that does not exist.
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