So you are watching a flashback
and everyone looks younger, except the old guy. Apparently in fiction the more you age the more you look the same. So in a flashback an old character may look more or less the same while everyone else looks noticeably younger. If the character is mostly the same with a small difference like a different hairstyle (provided the it isn't related to a sign of age like going bald) it still counts. If multiple characters are exposed to the Fountain of Youth
, the old character looks the same it also counts. If there is a clearly discernible reason aside from this trope like the character is a vampire (which tend stay the same age), then it doesn't count.
[[folder:Anime and Manga]]
- Makrov in Fairy Tail still looks the same in flashbacks that have the other characters children and early teens.