All of the kids in that time were smarter, and a lot less pampered than Konoha's Wonder Genin. They're mentality, even Tobirama is near Jounin in the current manga, I agree with Harashirma the adults were stupid back then.
Show Me How Much You Have Evolved...(As Tian walks toward an Army he's been waiting eons for).
I speak 4 languages...
English, Profanity, Sarcasm, and Real Shit.