Answer:
The answer is: He feels anxious about aging.
Step-by-step explanation:
And indeed there will be time
To wonder, "Do I dare?" and, "Do I dare?"
Time to turn back and descend the stair,
There’s still plenty of time to do all the important things Prufrock wants to do, but now he’s second-guessing himself.
With a bald spot in the middle of my hair—
[They will say: "How his hair is growing thin!"]
My morning coat, my collar mounting firmly to the chin,
My necktie rich and modest, but asserted by a simple pin—
[They will say: "But how his arms and legs are thin!"]
He is losing his hair and getting thinner. He is also concerned what other will think.