Indeed Tevez is still good enough to play, but the statistics are to decline in my opinion. Now he could only score a few goals and I think his stamina has decreased not like before. If you see news, Tevez claimed he was tired and he intends to retire early. I look at some of the interview, Tevez still confused about his future, and he is confused to accept the Chinese club.
I think thats because Argentine League is not too competitive for him, thats why he feels bored and considers to retire. Anw he is still 32 yo, which its not too old for a player as good as him. Well its up to him tho, he has full right to do what he feels best for himself.
But if he considers Argentine league not too competitive why he did not move to a more competitive league like the Premier League or the Spanish League? You're right, Tevez is still too young to retire because of his age is still 32 years old, but his stamina is not like it used to be. Maybe we better see his decision later, is he going to play football or choose to retire at a young age. Whatever the choice that is best for him.