From the given options, select the Figure of Speech (Poetic Device) used in the expression:

As old as the hills

Simile

The answer is OPTION 1 - Simile

A Simile is a figure of speech that compares two different things to show a shared quality, specifically using the words "as" or "like."In the expression "As old as the hills," the age of a person or object is being compared to the age of "hills" (which are ancient).The Comparison: Something's age is compared to the hills.

Pun: A pun is a play on words — it uses words that have similar sounds or multiple meanings to create humor or a clever effect. Example: Time flies like an arrow; fruit flies like a banana.
(Here, "flies" is used in two different senses.)

Personification : This involves giving human traits to non-human things. "Hills" are not being given human traits here; they are simply being used as a benchmark for time.

Metaphor: A metaphor also compares two things, but it does so directly without using "like" or "as".