Aspects of Kamala Das's Poem 'My Mother at Sixty-Six'

Question

This poem 'My Mother at Sixty-Six' is in our curriculum and I have a few questions on this:

1. Why does the poet capitalise 'Young Trees'? Why not just leave it as 'young trees' as it is not a proper noun?
2. Why has the poet chosen the age of sixty-six for the title of the poem and as the age of the mother? Why not any other number?
3. What is the purpose of placing the word 'pain; in a separate line? (It looked as if the word wrapping had made it look like that but it seems it's been intentionally left.)

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EDIT: Regarding the 3rd question: it is sourced from here.

Answer 1

1. She capitalizes "Young / Trees" for emphasis, to heighten the contrast with her mother, who "was as old as she / looked." Also, if the words had just been "young / trees sprinting," then "Young" would apply only to the trees. As Das has written it, the word could be a metonym for all the youthful things the speaker sees: not only the sprinting trees, but also the children spilling out of their homes.
2. Das's poems are known to be largely autobiographical. Presumably her real-life mother was 66 when she wrote that poem? That's the simplest explanation that comes to mind. I'm unaware of any particular significance to the age 66 in Indian society, unlike (say) 60 or 80, which are marked as special turning points.
3. The textbook reprints the poem unforgivably poorly. The word wrap makes nonsense of the actual line divisions. The version at the English for Students website makes clear that "pain" is not in fact on a line by itself, it's the last word of a line.