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

The best way to store old photographs 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, archival-quality photo albums or boxes to prevent damage from light, moisture, and chemicals. Handle them with clean hands and avoid touching the surface of the photographs to prevent fingerprints and oils from transferring onto them.