The Ottawa Senators will go into tonight's game 5, hoping to stave off elimination, with just one player above the age of 30 - their goaltender. That's not to say that the team doesn't have its veterans: Milan Michalek, Clarke MacArthur, and Marc Methot definitely fall into that category, as does Erik Karlsson, now in his 6th NHL season.
It certainly speaks to the quality of the rest of the lineup if Dave Cameron is changing the lineup even though they put together the best game of the series in Game 4. I believe it's the right move though.