I watched it when it first came out, then rewatched it last week because it kept coming up as the top suggestion on Netflix and its been a few year now.
As far as the age topic and the perception from that, I was in kindergarten for the first superbowl appearance. Experiencing those four years as an elementary school kid, it made me feel that it was just a normal thing for the Bills to be in the superbowl, let alone the playoffs. Fast forward a few years when I understood the sport a bit better then understand what the achievement those years really meant. Then just to be hit with the drought soon after was a real punch to the face.