Rebuilding teams should not be giving up two future pieces for a 28 year old.
Fans should not be so hung up on ages of players. I don't think they should trade for Barrie, but I really think this is something that fans need to get past. There should not be some qualifier like "must be 25 or younger or I have literally no interest."
Cholowski and 35OA are quite likely to never match up in value to a Trouba or a Barrie or similar. The chance is greater that the established NHL player will do more for the continued success of the roster than two future pieces who aren't A+++ prospects.
Now that doesn't mean go willy-nilly trading assets to get better or to be a bubble team, but if I can get you a top pairing D capable D for those two pieces and he's not 38 with one year left in the NHL, not just on his deal, you're insane to not at least look at it. I mean, even in the throes of a rebuild, give me a player that I can count on to be a legitimate puck mover that will let my team stay competitive in games (therefore, helping to develop any forwards we draft because they'll have the puck actually getting to them to do some things) and I'd strongly consider the deal.
People have started to get dogmatic about "The Rebuild" or "The Process" and are losing sight of the fact that you should be doing things that overall improve your roster for this year as well as the future. Don't sign veteran forwards to long term deals and lock up your money that way... but if there is a Matt Duchene on the market that you land at 8M a year (not likely to happen given other deals around) then you can start to turn your eye 100% to fixing your D. Have a plan and follow the plan, but adjust it based on what's available.
The biggest thing that has been and will keep driving me nuts are the people who stoutly refused to sign Karlsson before SJS re-upped him. Not because of his injury concerns, but because it's "not the right time in the rebuild". Well, then when is the right time to add an elite piece? Why is there a wrong time to add an elite piece outside of the like 2013-2015 years where you'd have to gut your roster of futures to make it happen?