“老而彌堅”是一個富有褒義色彩的漢語成語，形容人雖年老，但志向、意志或身體反而更加堅定、強健。以下從漢語詞典角度對其詳細解釋：
指年齡大，進入老年階段。《現代漢語詞典》（第7版）釋為“年歲大”（商務印書館，2016年，第792頁）。
意為“更加”“愈益”。《現代漢語詞典》标注其副詞義為“越發”（第919頁）。
指堅定、堅強，可形容意志或體魄。《古代漢語詞典》釋為“堅固；牢固；堅定”（商務印書館，2014年，第695頁）。
合成釋義：年老而意志或體魄愈發強健堅定。
形容人雖年事已高，但精神、志向或身體狀态比以往更顯堅韌剛強，強調隨着年齡增長而愈發積極向上的生命力。
他雖年過七旬，仍堅持科研攻關，可謂老而彌堅。
明确收錄該詞條，釋義為：“人老了，志向卻更加堅定。”（第412頁）
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“老而彌堅”是一個漢語成語，以下是其詳細解析：
如需更完整例句或古籍原文，可參考《續刻蕩寇志序》及相關成語詞典。
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