The statement that best describes the author's point of view about his younger self in this passage is:
4. He finds the thoughts and behavior of his younger self to be amusing.
The author’s playful and somewhat self-aware portrayal of his younger self's behavior—sneezing to gain attention, stretching and pretending to be bored—indicates a sense of humor and fondness for those antics. He appears to look back with amusement at the lengths he went to exhibit his superiority over the "untravelled" country boys.
The way the author develops this point of view is:
4. by telling about acting "mightily bored" for a group of country boys.
This action reveals his desire for attention and his enjoyment in being perceived as a more experienced traveler, underscoring the humorous aspect of his behavior and illustrating how he finds amusement in his younger self's antics.