People in middle age become completely disillusioned with what? The first is disillusioned with travel. Originally, seeing the world through travel is the most basic way to see the world. The second is disillusioned with all interpersonal relationships, including parents, spouses, relatives, and friendships, because human nature is truly hard to describe. The third is disillusioned with social relationships, work, and leaders, understanding that this world is really just a makeshift stage, and most people are ridiculously superficial. So, in middle age, one finally understands that contentment brings happiness, and living a good life is more important than anything else.