This is why the resources of a great Sect are not as good as those of the Ten Great Clans,, it could be said to be a bit better than an average Immortal Sect, otherwise he wouldn't have ended up as a mere Servant Disciple, the lowest level of disciple, and endured three years within the Sect.
That was the price of his youth,, how many three-year periods does one have in their life?
In the Cultivation World, a person like him with his current level of cultivation could possibly live for over 2000 years, and that's with the inclusion of eating lifespan-extending fruits.
Those present in the room who saw the herbs Jiang Tang put into the Alchemy Furnace, although they were the same herbs they used, seemed to exude a much richer spiritual energy when sniffed.
