The pattern に至るまで (ni itaru made) is used to indicate that something goes as far as a particular extreme point, often implying that the range is wide or that even the final point is included. It is similar to 'even' or 'as far as' in English, but it often carries a nuance of thoroughness or that the extent is noteworthy. For example, 子供から大人に至るまで means 'from children to adults' but with a sense that the scope is complete, including even the oldest. This pattern is typically used in formal or written contexts, such as news reports, essays, or speeches. It is less common in casual conversation, where simpler expressions like まで might suffice. When used with a clause, it often follows the plain past or dictionary form to mark the final stage of a process or progression. The nuance is that the speaker is emphasizing the extremity or completeness of the range.