In the sentences with "as", I read "as" as meaning "because". However, it seems that you don't intend that. In the first case, you can express the right kind of meaning with "As you get older, you can be smarter".
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Hans51When we rewrite the comparative, the comparative, should we always use 'as'?No, we normally simply write, for example, "The older you are, the smarter you can be" or "The more food you eat, the fatter you will be", just as you did. Sentences with "as" may be possible along the lines of the ones you wrote, but the first part should describe a process of