What does the image of young trees sprinting symbolize in the poem?

In My Mother at Sixty-six, the image of “young trees sprinting” symbolizes the vitality and continuity of life in contrast to the poet’s aging mother. As the car moves, the trees appear to race past, representing energy, youth, and the passage of time. This lively scene stands in sharp contrast to her mother’s frailty, emphasizing the natural cycle of life where youth and old age coexist. The “sprinting” trees subtly remind the poet of life’s transient nature and her own silent fears of losing her mother.

This question related to Poem 1 English Flamingo Class 12th NCERT.
From the Poem 1. My Mother at Sixty six.
Give answer according to your understanding.