Madara might be the man that the frog sage was talking about

[abhiraj]

Its gotta be Sasuke
he is the youngest
probably not a man though

 

[dolama]

madara, tobi, and sasuke are all "young men" to the toad sage since the toad is over 1000 years old

 

[themalaysia2222]

that frog has made so many mistakes in the past by mis-telling the future

i dont knw why you guys trust him

This. I mean, who knows that "young" that the frog refers to is different than the "young" we used to think. It's an old frog,it sometimes has forgotten Naruto's name. when naruto said he already knew,i can feel something like it's gonna be different that what we think it is. Remember,the mangaka is kishi. even a single word has a thousand hidden stories. and I agree with the guy above me,the toad is over 1000years old already :-/

 

[Drakengard]

Prophecies shouldn't be taken so seriously. Predictions can be unclear at times and one may destroy themselves trying to stop future doom (that may not be what the person had in mind).