Martial Artists who haven't undergone Bone Marrow Cleansing reach their peak around forty years old. After surpassing forty, they begin to decline.
If one solely cultivates Body Refining Techniques without embarking on the path of Bone Marrow Cleansing, their physique won't reach Lin Zheyu's level before their body starts to decline.
This is also why in Martial Dao cultivation, condensing Qi Blood is considered of utmost importance.
The greatest difference between the Bone Marrow Refining Realm and the Qi Blood Realm is the incredibly powerful physique.
If the physique's strength is somewhat weaker, it might still be possible for a Qi Blood Realm Martial Artist to have cultivated it through Body Refining Techniques.
But the strength of Lin Zheyu's physique is something ordinary Qi Blood Realm Martial Artists simply cannot achieve.
