I just saw a pile of comments added to old answers requesting for an update. I just find this to be a bit odd. Is this going to be done to all the questions?
From the question activity, I believe you're referring to yesterday's comments asking for editing an answer that does not meet the site requirements.
You may be aware that IPS is in public beta, which means we're still defining and tuning the scope, guidelines and requirements.
Last year the community updated what they think should be prerequisites for an answer to be valid, which unfortunately invalidated a significant number of old answers. Now the thing is, some users discover IPS through one of these old questions. What would happen if they saw such a question, studied its answers and then decided to answer a question themselves? They would likely be influenced by what they saw and how people shaped their answers. And then? Their answer gets flagged as "very low quality" or "not an answer", even downvoted maybe, and they do not understand why, because they did as others do before and they were not told anything about not meeting the site requirements. Such user would be likely to get upset, and I totally understand why.
So, is the community going to do this for all answers that don't meet IPS new requirements? Yes, eventually. I understand how this may be bothersome for people who answered a long time ago (and even got a lot of points from it maybe, I had quite a bunch of old answers to edit myself to address citations expectations), but it seems to me to be a mandatory step to make in order to provide the best possible content on IPS (and eventually graduate).