Raiga died when Gai was around 12 years. Let's say, Buntan was 2 years old at that time. So, (31-12)+15=34 years have passed. 34+2=36. Buntan is around 36 y.o. —This unsigned comment was made by DaGrand (talkcontribs) .

How did Raiga die when Naruto, who killed him, wasn't even born? • Seelentau 愛 14:24, October 26, 2017 (UTC)
No one said that Duy killed Raiga. Supposedly they are making Naruto fight Raiga canon, but that doesn't make the entire filler arc from part 1 canon, they just canonized that at some point, Naruto fought Raiga and may or may not have killed him. This could have happened anytime between Part 1 and Part 2 for all we know.--Elve [Mod] Talk Page|Contribs 15:16, October 26, 2017 (UTC)

Given her young appearance, it can be inferred that the anime filler is at least, somewhat canon. It's likely Buntan was born shortly before Raiga became an ANBU and found Ranmaru. And given his death at the time when Naruto and friends were around 12-13 years old, and their current age being around 32-33 years old, we can deduce that Buntan is, at least, 20+ years old. AMTNinja (talk) 16:35, April 15, 2018 (UTC)