Feng Jianming had reached the zenith of his age before he finally broke through to the Grandmaster realm. Although he succeeded in the breakthrough, his age prevented him from fully mastering it, and he did not become a normal Spirit Aperture Grandmaster, nor could he gain the lifespan that a Grandmaster should have.
Where does a Grandmaster's lifespan come from?
The main source is, of course, the transformed power within the body. The true energy of a Grandmaster at the Spirit Aperture realm is no weaker than Mana. This powerful energy constantly circulating within the body can bring continuous vitality and thus extend life.
When Feng Jianming broke through to the Grandmaster realm, the enhancement brought about by the realm was more in the soul. Elevating the soul helped increase his lifespan, but without the Grandmaster-level true energy equivalent to Mana, the increase was not significant.
