It's been shown time and again in wuxia fiction that those who attain the very pinnacles of martial arts tend be those who are humble and have no ambition to be great martial artists. We see this with Jin Yong's Janitor Monk, Hui Juk, Deun Yu, and Cheung Mo Gei, among others. Not to say the ambitious don't become great martial artists as well (they frequently do), but the humble, selfless ones tend to end up transcending mere greatness.
I wonder if Fa Mun Lau from Gu Long's LUK SIU FUNG was such a character who would eventually, in his old age, become one of those supreme enlightened masters (with martial arts far beyond such peers as Luk Siu Fung or Sai Mun Chui Sheut). Fa Mun Lau was one of the most humble, pure characters in all of wuxia fiction. He seemed to be especially enlightened, and there was an extraordinary spirit of calmness and benevolence within him. Even though he was quite young during the LUK SIU FUNG saga (most likely mid-20s and certainly not more than early-30s), he had already attained the insight that there is really only one sword art (a principle that one of his opponents, the Ngor Mei Sect's Soo Siu Ying, could not comprehend). This leads me to believe that an older Fa Mun Lau might have been able to ascend to the highest levels of martial arts.