We cannot say with certainty.
However, there is considerable evidence to suggest that all the poems in Sonnets 1-126 were addressed to Shakespeare's patron, Henry Wriothesley. In Sonnet 55 he appears to continue his flattery of the Earl through a recurring theme of immortality through verse (picked up here from the closing lines of the preceding sonnet). Read more in the link below.
Dark Lady
Sonnet 18 and sonnet 116
The theme of the Sonnet 32 by Shakespeare was "handsome youth."
Sonnet XXX. Shakespeare's sonnets do not have titles, just numbers.
yes
Dark Lady
On a primary level he is talking about the poem which he is writing and you're reading - early element of postmodernism perhaps :) He is also talking about the poetic form generally, implying that nothing, even marble or monuments can outlive the poetic form. People, concepts and objects can be immortalised in verse with more longevity and impact than anything constructed out of material.
Sonnet 18 and sonnet 116
The theme of the Sonnet 32 by Shakespeare was "handsome youth."
Sonnet XXX. Shakespeare's sonnets do not have titles, just numbers.
yes
The theme of the poem is that literature is more enduring than architecture.
If you mean William Shakespeare's sonnet 73, it is not surprisingly a Shakespearean sonnet.
It's a sonnet of course.
spensarion sonnets or elizabethian sonnet
The paradox in Sonnet 55 by William Shakespeare is the idea that the poem itself can defy time and preserve the memory of the beloved for eternity, despite the inevitable decay caused by time. This paradox highlights the power of art and poetry to transcend temporal limitations.
This is the first line of Sonnet 18 by William Shakespeare. Shakespeare suggests that the memory of beauty will be immortalized in the sonnet. (see related question)