The former Aston Villa winger also praised the 29-year-old's all-round ability, feeling the Dutchman has settled in very well at Old Trafford.
"He's a world-class striker who can not only score goals, but lay on assists," Young told United's official magazine.
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"He's fitted in very well but it's easy for any player that joins United to fit in because the players here are so good at making you feel welcome and really help you settle in.
"It's still only early days, but you can already see he's formed some good link-ups in training and on the pitch. He's a great addition to the squad and I'm sure he will have a big impact this season."
Young also feels that United's entire strikeforce is one to be feared, joking that he is happy he does not have to choose between Van Persie, Wayne Rooney, Danny Welbeck and Chicharito.
"Any defender that comes up against the attacking options we have would be nervous," Young stated. "I would be!
"I must say, I'm glad I don't have to pick the team [although] it's great as a winger to see so many good strikers in front of you who can get in the box and finish.
"We're there to provide for them because we know every single one of them can score goals and we hope they all do that this season."