:By 1995, he is old enough to know this thing. If you are consistent with the historical present, that is fine.
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Johnson13When we descibe the content of a book, even if it's related to the biography of the dead writer, we can still use the present tense, but how about when the time is clearly stated as in the past?:By 1995, he is old enough to know this thing.If you are consistent with the historical present, that is fine.