United were 2 goals down at the break and fortunate not to be completely out of the game, having been outclassed by their noisy neighbours.
A complete contrast followed in the second half, nonetheless, as Paul Pogba scored twice in quick succession and Chris Smalling volleyed home from close range to earn the Red Devils a 3-2 victory.
Speaking after the match, Herrera spoke of the part played by experienced heads Young and Carrick to inspire United to all 3 points.
“Everyone was talking but of course the oldest guys with the most experience – Ash, Mike – were in the dressing room.
“They have power in their words. We just talked about the pride, about the club, this club – you can never underestimate it.
“We didn’t talk too much about tactics, just about our pride. Our pride on the pitch and that our fans were going to have a difficult night if we got beaten. We did it for them and of course for us and our position in the league – but overall for them.
“I was thinking at half time that it was going to be difficult for our fans if we got beaten so I’m happy for them,” he told reporters.
Ander Herrera might face steep penalty from the Football Association after allegedly spitting on a Man City crest close to the tunnel area during the dramatic derby.