I don't think a reasonable person should be chewing out loud like an animal while eating in a public space.... Its disgusting and uncomfortable....π§πΎββοΈ
He is stated to be around 150 years old. So canonically, he was alive during both the beginning and the end of the war.
Although he does not appear in the final episodes during the defeat of Fire Lord Ozai, there is no indication that he died before the war ended.
Guru Pathik did actually witnessed both eras....Guru Pathik tells Avatar Aang that he was a spiritual brother and close friend of Monk Gyatso, which means he was already an adult before the war began.