If someone is frail and sickly, a walking invalid, how could they possibly live long?
To live long in itself signifies a body that is powerful and robust, far beyond ordinary people.
As for his current lifespan of over a thousand years, it did not mean he could only live for a thousand-plus years now.
It meant that, with this trait as a blessing, even an ordinary person, relying on the immense Life Force within their body, could live for over a thousand years.
As for eternal youth, that signified that his bodily functions would forever remain at their Peak.
For ordinary Martial Artists, if they do not step into the Inner Strength Realm, as their age increases, from thirty onward their bodily functions begin to go steadily downhill.
Thus the prime Gold age of advancement for a Martial Artist is before their bodily functions have begun to decline.
