I think it is fine to comment on the old videos, just don't get salty if you don't get a response. The pros are very busy, and don't have time to reply to every single comment

I will answer this question in 2017.

In my opinion it's fine to comment on any videos (or other threads) regardless of how old they are. Sometimes good things come out of it. But, like JerseyGrinder23 writes, it's not necessarily the case that others will notice your comment, so just be aware of that.

Its ok imo, but its also ok that you dont expect PROs to answer on all their vids infinitly, from date(released video) on. Vids and threads are like New fashion collection, everybody pays attention for a while when its released and then it becomes passe/known thing/archive...
Things in poker change rapidly, thats what i meant to say.

Go ahead and comment, but you might not get an answer. Commenting on new videos will give you a better chance of getting responded.

Everyone seems to have the right idea so far. No problem with comments on any of the videos regardless of when they were released however the coach might not be able to get you an answer because they no longer work for us or don't remember the situation from the video that you're asking about. That said, it certainly can't hurt to post your questions.

ok thanks guys

Maybe a few pro's can do a video where they go over questions from old video's.