Reborn into a second life. Although it sounds a lot like the fantasy settings in many online novels Ian read in his past life, which even science fiction writers are hesitant to use, it's not particularly exaggerated because Terra really does have swords, magic, and aether.
Especially things like the longevity magical plant and life-extending treasures, they're actually not that complicated.
The first time Ian encountered Yisen Gard and his group was due to a longevity magical plant.
This kind of magical plant extends life generally through two methods. The first is by adding a large amount of life essence, essentially increasing one's health bar, so naturally, the lifespan extends. However, it can't cure various hidden injuries and wear, so the older one gets, the less effective it becomes.
