HT4486: iCloud: My Photo Stream FAQLearn about iCloud: My Photo Stream FAQ
Currently Being ModeratedMar 30, 2013 5:09 PM (in response to Lfoeaman)
iCloud only keeps photos in your photo stream for 30 days, but they will remain on your iPad (up to 1000 photos) until you delete them. I believe Apple TV will only display the photos that are still in your photo stream, not photos earlier than 30 days ago.
If the older photos are on your iPad, you could always open them on your iPad and use AirPlay to display them on your Apple TV.
Currently Being ModeratedMar 31, 2013 9:23 AM (in response to Lfoeaman)
You can use a Shared PhotoStream to bypass My PhotoStreams limitations. Make sure you still have a more permanent backup solution with multiple copies on a computer and it's backup.