Teenager?
Current Madara and Kabuto with Edo Tensei for sure, Nagato and Tobi debatable.
Naruto also debatable if Mokuton isn't suppressing his Biju Chakra (I guess it does).
"Hashirama died shortly after the founding of Konoha in one of the many wars that were raging during this revolutionary era, but not before passing on the title of Hokage to Tobirama."
I'm doing a Naruto Timeline, and I presume that he died around his 40s (47 exactly), there is no way that he was a teenager.