Pointers

I was just curious to know at what age do puppies start coming to you and telling you that they have got to go potty outside? Our mini dachsund is going to be 14 weeks on Sat.13th. He seems to be extremely intelligent. He listens very well, he does all kinds of tricks, he is leash walking pretty good now, he will go potty outside almost every time he is taken out but he will not tell us. I understand that he is still young and that he is doing a great job but we are just curious as to when we should be able to start depending on him to tell us when he needs to go out.