Yes, they have done well to still be playing at high level. But it's clear that not everyone enjoyed this youthfulness of the mind. Biguiser has fallen to 2170 and plays at that level now. Beating him now would not be as difficult as beating a 2500 rated GM.
"Viktor is 84 years old and is still play chessing winning the pants off of people from time to time lol."
1. Actually he suffered a stroke and can't play anymore
2. Back then he was winning the pants off people all the time, not time to time, its clear he's not at world no.2 level anymore
Thats funny, in the eyes of strong players, it wouldn't be viewed as equivalent. Deep down they would know you only beat a retired player way past prime, how would you feel beating up Ali in his 80s when he's confined to a wheelchair. I guess most players just want the bragging rights to their buddies and tell everyone that beat a GM.
You are trying to use a boxing metaphor.
Which relies mostly on physical strength not mental strength.
There is a difference between physical strength and mental strength.
However, I can use a boxing metaphor with physical strength to show the flaw in your metaphor.
Old George Foreman way past his prime did 1 punch that shocked the world becoming the oldest World Heavy Weight Champion in history.
He retired in 1997 at the age of 48, with a final record of 76–5, including 68 knockouts.
Let wikipedia show you the truth!
https://en.wikipedia.org/wiki/George_Foreman
While the above metaphors are about physical strength which chess is considered hugely alot more on mental strength.
I can always prove you wrong on that regard as well.
Some players in chess remained very dangerious players even up until there late 60-80's.
Emanuel Lasker
https://en.wikipedia.org/wiki/Emanuel_Lasker
Viktor Korchnoi
https://en.wikipedia.org/wiki/Viktor_Korchnoi
Viktor is 84 years old and is still play chessing winning the pants off of people from time to time lol.