I wouldn't consider Walker to be young age wise, he's the same age as Maatta (26), although it seems as if Olli has been around forever. I do hope he continues to excel as he showed well last season and the club obviously believes in him seeing they locked him up for 4-years.
Roy too will be 26 come March 1.
If we are talking NHL experience, then yes they are both green with roughly 200 NHL games between the two of them
This is obviously going to be an odd season with such a shortened training camp and no pre-season games to get up to speed, I'm not sure we will see anyone really breakout but, I will interested to see how Anderson does given regular ice time.