@owlette was about to say the same thing. No way you're going to adjust to a new world only after a few weeks or months. Not after you've lived at least two decades in your original world. It's good that they didn't overlook or intentionally dismiss that aspect, like most isekai stories. And they did it in the way that makes readers can relate to, too.
Too bad this series is getting a lot of hate for the spoilers that was posted on the earlier chapters. If people want to hate, it's more appropriate to hate the novel first. Since the webtoon has a chance to turn things around.