the 2nd oldest man on earth. Every time people ask him how he got to be so old he gives a ridiculous response that meanders to an unanswerable conclusion.

To what do you credit your incredible longevity?

"I always used dental floss."

"haha that's great. You kids at home pay close attention ya hear."

"so, seriously how did you get to be so old?"

"I always been a flosser, from day one. they used to laugh at me back when all I had to use was a piece of string I traded with the girl up the street, Claribel, for two blue eggs from our chicken Rosie who laid colored eggs, gods honest truth."

"So, you credit living so long to flossing? Were there any other secrets you might be able to share."

"I would floss every night before I went to bed and every morning when I woke up with that string and this was before floss was invented. people called me foolish. If i had patented the idea when i had it id be a millionaire!"

Is there anything anything more too it than dental floss? You see I'm terrified of dying and you seem to be the most experienced person at not dying so let me know your secrets. Don't keep them from me and all the other young people like a greedy old person. I know you know! Tell me! Tell me how to live longer!"

Jumps over table. Forces 2nd oldest man to plead uncle. (a simple task)

Oldest man pleads for clemency. Gives in on the condition that he will only tell the host and the host can't tell anyone else.
Host gives a big wink to the camera, says ok.

2nd Oldest man asks for a pen and paper. Thank you. Pulls out a decoder ring starts writing. Finishes note, passes the paper and the decoder ring across the table. Host starts to solve

"be sure to floss"
You no good scoundrel!
Hey, look over there.
What?
2nd Oldest man runs off

what if the oldest guy in the world knew the secret to longevity but wouldn't tell anyone. He thinks its funny but everyone else takes it serious.

Is there any non dental floss?

I genuinely asked my 100 year old great grandmother the question "how did you get to be so old?" and she genuinely gave me the answer "dental floss" and I never asked a follow-up question so now that is the answer

In a competition to laugh best
The oldest man in the world dies and the second oldest man in the would laughs last.
Ha ha! Everyone born before me is already dead. I outlasted em all. Ha ha. Hahaha. HAHAHA!!!!