The tone of the passage is nostalgic.

Explanation:
The tone of a passage refers to the author's attitude or feelings towards the subject matter. In this case, the author's tone can be identified as nostalgic based on the language, imagery, and overall mood conveyed throughout the passage.

Language:
The passage uses words and phrases that evoke a sense of longing or wistfulness, which are often associated with nostalgia. For example, phrases like "reminiscing about the past" and "cherished memories" indicate a sentimental and reflective tone.

Imagery:
The passage paints a picture of a bygone era and invokes memories of simpler times. The author describes "old photographs" and "fading letters" that hold sentimental value, further emphasizing the nostalgic tone.

Mood:
The overall mood of the passage is one of longing and bittersweet reflection. The author expresses a deep affection for the past and the memories associated with it. This sentimentality creates a nostalgic atmosphere that permeates the entire passage.

Key Pointers:
- Use of words and phrases that evoke longing or wistfulness
- Description of old photographs and fading letters
- Sentimental and reflective tone
- Overall mood of longing and bittersweet reflection

Conclusion:
In conclusion, the passage exhibits a nostalgic tone through its language, imagery, and overall mood. The author's sentimental and reflective attitude towards the past creates a wistful atmosphere that resonates with readers.