Question

And indeed there will be time

Answer 1

The  lines indicate that the speaker is concerned about what others think of him are:

With a bald spot in the middle of my hair—
[They will say: “How his hair is growing thin!”]

Answer 2

The correct answer is:

With a bald spot in the middle of my hair—

[They will say: “How his hair is growing thin!”]

These lines express how the speaker fears the judgemental thoughts of others by showing in plain sight the state of their decaying hair.

It is natural for people to be concerned about their physical appearance, given it is the first attribute any stranger would divise while meeting them. Losing one's hair is a common problem while growing old, and since there is no clear solution for this problem, it becomes a matter of self-concern.