A humble expression used by an old person to refer to themselves as being old and infirm, like an old dog or horse with worn-out teeth; old and decrepit (a humble self-reference).
老王谦逊地说，自己已是犬马齿索之年，精力大不如前，但仍愿尽绵薄之力。
Old Wang humbly stated that he was already in his declining years, with much less energy than before, but was still willing to contribute what little he could.
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