Users have the option to turn on i Cloud Photo Library (Beta) but also the option to keep Photo Stream as well.
Photo Stream will disappear next year at some point, along with the death of Aperture and i Photo for Mac which Apple has announced it is discontinuing.
Follow these steps to delete older photos from My Photo Stream and put your most current photos on all of your devices: If you turned on i Cloud Photo Library, your My Photo Stream photos from your other devices can be found in the All Photos album.
If you can't find your My Photo Stream images in the Photos app, follow these steps: Your device will keep up to 1,000 photos, even if they're older than 30 days.
The biggest advantage of Photo Stream is its compatibility across all devices, including Mac.
Any new photo taken on your i Phone or i Pad would show up in the Photo Stream in i Photo, Aperture and on any other i OS devices associated with the account. Although if you remembered to open i Photo and let Photo Stream sync, all your photos would be saved on your Mac, not just the previous 30 days.
Photos older than 30 days are removed from the i Cloud server, so depending on when you enabled My Photo Stream, your devices might not have the same photos.
Due to capacity, your Apple TV might display only your most recent photos.