Isso se chama Tempo dos quadrinhos , também conhecido como Linha de tempo flutuante também conhecida como Escala da escala de tempo.
The problem is this. On one hand, Superman is a high-selling, successful character with a lot of licenses and so on based off of him. You don't want him to age or die, because that means losing that successful character. On the other hand, Superman exists as part of a greater universe, and if all the stories in that universe are continuously frozen in time, that cuts off a lot of possibilities. So what do you do? Comic-Book Time. You use the illusion of time passing. You never refer to specific dates if you can help it, and you let characters change, but only a little.
Também relacionado a Não permitido crescer
Ou você pode estar pensando em Continuidade Negativa
Not only is there no established continuity, but the show is free to completely wreck the continuity and be assured of a full reboot by the start of the next episode. Burned a hole in your favorite outfit? Don't worry, it'll be better next episode. Burned down your house? No worries, it will be back next time. Turned into a frog, died, destroyed the universe? No problem! If one episode ever continues from the last, it's only because it's part of a storyline too long for just one episode — don't expect any apparent changes from the previous episode to be recognized outside that specific storyline.