Question

Figures of speech present in the sentence her aged hand on his strong young arm

Answer 1

Hey there!!

In the given sentence, the figure of speech that is used :
ALLITERATION (Sound 'h' )


The other one is IRONY

THANK YOU
@SRK.

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Answer 2

The figure of speech used in the sentence, "Her aged hand on his strong young arm" is the antithesis.

Antithesis is the type of figure of speech which refers to express an idea which is contrast or opposition to another idea.

In other words, it refers to the thing or person which is in opposition to something or someone.

As in the above sentence, two different ideas expressed are, "Aged arm" and "Young arm."