He believes Evra's attack-minded approach to his full-back role has allowed Young more space to display his talents.
"Some players come to a club like ours and find it difficult to settle in but Ashley has done exceptionally well," said the United boss. "He is versatile and has a good understanding of the game.
"He is getting great support from Evra on the left-hand side. The great experience Patrice brings is very important for a player coming to our club."
United first spotted Young's talent many years ago.
However, Ferguson concedes the 26-year-old is a different player now to the one he kept an eye on back then.
"We tried to get him when he was at Watford but were just a bit late," he said.
"He has matured at Aston Villa and his form last season was fantastic considering they had a difficult year.
"Since he has come to us, he has taken the challenge very well."