He's 'nearing' 30 next Feb. you wouldn't call Zlatan nearing 32 with his b'day in October. 29 isn't old and he's got 3 years of WC service left in him at a bare minimum. He is a game changer while Higuain isn't.
You are horrible at comparing, i'll explain you why, so you hopefully understand it.
Zlatan : 31 and still beeing top3 striker in the game. Seemingly immume to aging, and getting even better each passing year. Formidable physique beeing a part of this.
Higuain : 25. Was a gamechanger at age 20-22 under pellegrini. Didnt fit in mou's real but had an incredible goal to minute ratio. Had just one(this) bad season since.
Tevez : 29 . Was a gamechanger, till 2 years ago, where we was mostly average. timebomb that can moan and cry every moment about going back to argentina.
As you can see, Higuain high quality that can quickly turn world class. Zlatan seems to be a certainty for another 2 years of world class. Tevez was worldclass and seems to be in decline, wants to go home.
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Di Marzio said we have an agreement with the player
tevez or higuain