Reno tensi can revive even those that have died generations back:

[Curteth]

Rinne Tensei can revive even those that have died generations back:

...if they are in close proximity when it's used..?

Spoiler

like the Kages

not sure if this spoiler mention was neccecerry, but I'll play it safe. Because like Tobi, I'm a good boy~

 

[SAGE OF ALL ELEMENTS]

They could not have died for too long for it to be brought back..

Go back to the scene where naruto went talk no jutsu on nagato

 

[Noni]

as long as you have the DNA it doesnt matter how old they are or from which time period

 

[sulanis]

as long as you have the DNA it doesnt matter how old they are or from which time period

I think you're thinking of edo tensi

I think the creator of the thread is refering to ability that Nagato used to revive the leaf villages soldiers.

 

[Filo]

yes it can i believe

 

[Curteth]

They could not have died for too long for it to be brought back..

Go back to the scene where naruto went talk no jutsu on nagato

Ah.. Overlooked no jutsu

Edit:

Also edited the title, hope that helped.