Aの至り is a humble expression used only in formal writing and speeches meaning that A is the highest, extreme state. Usually used in positive contexts, when talking about the speaker or her/his group. Generally follows expressions like: 光栄、赤面、感激、恐縮、同慶. 若気の至り is a set expression used when describing something that one considers an error made due to one's inexperience and young age.
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