I do not feel nostalgic from old photos, but from old "feelings". A certain "feeling" of a day may send me in a bout of nostalgia. For instance, a certain temp and breeze reminds me of a night that I spent 5 hours playing Pokemon Gold (catching the Red Gyarados at Rage Lake) at school while waiting for my orchestra concert to start.
I have, however, felt a bit of longing for older times when perusing my personal old imageboard thread archives. Old memes, old discussions, and old projects. Reviewing these things reminds me of what shaped me online, and what came prior than that. All of this to shape me into the idiot I am now.