Do you think that JY was comparing them in terms of martial arts, or does it seems like internal energy?
Borrowing noodle's translation:
Fa Wang’s martial arts and Guo Jing’s martial arts were separated by the smallest of margins, Guo Jing may have had more fortunate encounters than Fa Wang but Fa Wang was twenty years older than him; he had twenty years worth of internal energy more than Guo Jing. If the two fought one on one, they would have to exchange over a thousand stances to decide who was better. With first-rate fighters such as Ni Mo Xing and Xiao Xiang Zi by his side, it wouldn’t have been difficult to gain victory over Guo Jing but Guo Jing’s [Eighteen Dragon Subduing Palms] were too powerful and along with his palm technique, he was using Quan Zhen’s [Big Dipper Formation], he went to and fro as he fought and it was like as if he had separated into seven. Another reason why he was still holding them off was because of his immediate victory over Yin Ke Xi; this was a warning to the others and the remaining three made defence their main priority and did not dare to make a rash attack so although it was three against one, Guo Jing held his own against the three.
Basically my interpretation is that GJ has luckier encounters than GLFW with 9 Yin's cultivation, but GLFW has 20 years more worth of energy compare to GJ so he compensated for it.
Do you think Jin Yong was saying GLFW is 20 years older than GJ and have twenty years more training in martial arts, so although GJ has luckier encounters, GLFW was still able to be an equal?
Does it sound more likely to you that the "luckier" was refering to cultivation, or martial arts training, or martial arts+training?