What do they mean when they say that "minor orphans are poor and adult orphans are happy"?

As a minor, his cognition and understanding of society is not comprehensive, and he will easily feel the influence of negative emotions such as fear and loneliness. When he needed people's care and help most, he came alone, helpless and eager, but hopeless, without material enjoyment and spiritual encouragement and warmth from his parents, so he was lonely and pitiful.

Adults can take care of themselves when they are old. The happiness mentioned here is the happiness when there is no helpless desire in adulthood. Compared with other adults with sound families, he is still poor, just a person, a person who is no longer a child when he grows up.