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The norm is the average range. None of your examples are outside the norm, meaning they're all things people wouldn't think were unusual. You seem to be asking "do I have to write characters wh...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43684 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The norm is the average range. None of your examples are outside the norm, meaning they're all things people wouldn't think were unusual. You seem to be asking "do I have to write characters who are in the center of the average range?" The answer to that is "no." All of your examples are about age and age has never been a very exciting deviation, except when it is extreme (and maybe not even then). Marriage between people in different decades of their lives has been quite common for a very long time. My great grandfather had (at least) 4 children with his wife. Three months after she died he married again. This was in 1893 and his second wife was my great grandmother. He was 42 and she was 21. They had (at least) 5 children. I'm sure nobody batted an eyelash at any of this. Some people marry young, some marry old, some don't marry at all. Some couples are the same age, some are very different in age. Some people start new careers when they're older than the usual career-starting age. Demographics are important and give you a sense of the scene. But they tell you nothing about individuals. Individuals do things on their own schedule. They don't check the charts to make sure it's okay. While it's true that people tend to follow the crowd, enough people don't that it really isn't unusual at all.