YSK that the average reading age in the US is that is that of a 13 year old, so when writing something for mass communication you should keep your language clear, simple, and unambiguous
from /r/YouShouldKnow
YSK认为，美国的平均阅读年龄是13岁，所以当为大众传播写东西时，你应该保持你的语言清晰、简单和明确。