Read these lines from the passage. The sixth age shifts

Into the lean and slippered pantaloon,

With spectacles on nose and pouch on side;

His youthful hose, well saved, a world too wide

For his shrunk shank, and his big manly voice,

Turning again toward childish treble, pipes

And whistles in his sound.

How does the alliteration "shrunk shank" affect the meaning?

Because the phrase "shrunk shank" is difficult to pronounce smoothly, it reinforces the physical losses that occur at this stage of life.
The sound of the phrase "shrunk shank" reinforces the sense of urgency that occurs at this stage of life.
The phrase "shrunk shank" adds humor to the passage and emphasizes the many joys of this stage of life.
The phrase "shrunk shank" creates "sh" sounds, which mimic the soft tones of a person at this stage of life.