[noun] + から言うと [noun] + から言えば [noun] + から言って [noun] + から言ったら
The grammar structure から言うと is used to express a standpoint or perspective from which a judgment, evaluation, or opinion is made. It attaches to a noun and means "in terms of," "from the standpoint of," or "speaking from the perspective of."
The speaker uses から言うと to frame which aspect or criterion they are basing their statement on. The noun before から indicates the specific angle being considered.
There are several closely related forms that carry the same meaning:
から言えば – uses the conditional form of ゆう言う; slightly more hypothetical in nuance.
から言って – uses the te-form; often used mid-sentence to connect to a conclusion.
から言っても – adds an "even" nuance ("even from the standpoint of").
The noun before から言うと is typically an abstract concept or criterion such as たちば立場 (position), せいかく性格 (personality), じょうしき常識 (common sense), じつりょく実力 (ability), or ねんれい年齢 (age). It is used in evaluative or analytical contexts.