Sometimes I’m accused of nostalgia for older anime.
My youth makes that impossible, though: a person can only feel nostalgia for something they’ve known. I’m relatively young. I feel nostalgia about Gundam Seed and Code Geass (rest assured that I harbour no illusions about their quality).
Since older anime is new to me, it attracts me because a significant chunk of it excels, a bigger chunk surprises, and almost all of it contrasts nicely with the newer anime that I watch.