The youth is like a pile of ashes as, youth burns bright but like a fire ultimately dies out.
By this line Shakespeare tried to reflect the reality/fact of youth by the means of life, death and growing old, that how near the deathbed is to the one who has come across that long journey of life.
It is so because the Shakespeare has described in his sonnet youth as by using metaphor i.e., pile of ashes. Here he meant that youth is also a timely/time bound thing which is one day going to be ashes as it burn bright like fire but just like that it dies out by the end.
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