On a formal level, the speaker’s final argument falls apart. The end rhyme of “wrong”/“young” is a slant rhyme, and does not offer the full forcefulness of a typical rhyming couplet. The meter of the final line is conspicuously weak as well. The pentameter falters on “ever,” which forces the syllables into unnatural stress patterns. The noticeable weakness of the final couplet underscores the weakness of the speaker’s fight against time. Despite his attempts to preserve his love through verse, time cannot be bested.