It's a very good question, most vids become less fappable over time. A big part is technology, anything less than 720p is very iffy, anything less than 480p is pretty much unwatchable now. But also the fashion, hairstyle, makeup, lighting, filter, color saturation etc also can date an AV very much, surprisingly. Weird thing I can enjoy very old movies (back to before I was born). But watching AV from 5+ years ago doesn't work, most of the time. Some times I can get a better erection by closing my eyes and playback a particularly good vid inside my head than by watching it on screen.
I can think of 4 girls who can (may) erect the test of time. Yuma Asami, she's the one I plan to test. I hope she can still bring it. Shion Utsunomiy. I found a bunch of her FHD vids from 2013-14. Amazingly she was more fappilicous than as Rion in 2016-18.
Finally Julia, she's double tested. Her old vids from 2010 are still amazing now. And her new releases, after 9 years and almost 400 vids, are still as reliable as current top idols. So her vids stand the test of time and herself is now approaching the status as longest lasting top idols. Even Yuma Asami lasted only 8 years. But indeed Tsubomi's 13 years and counting is undeniable.