What is the best way to store old photos to ensure their preservation and longevity?

The best way to store old photos for preservation and longevity is to keep them in a cool, dry, and dark environment, away from direct sunlight and extreme temperatures. Store them in acid-free photo albums or archival-quality boxes to prevent damage from light, moisture, and chemicals. Handle them with clean hands and avoid touching the surface of the photos to prevent fingerprints and oils from transferring.