1. facts, information, and skills acquired by a person through experience or education; the theoretical or practical understanding of a subject.
2. awareness or familiarity gained by experience of a fact or situation.
Speaking of knowledge, you seem to be strangely unable to recognize the limitations of yours, even when a thread is full of people discussing things of which you are utterly ignorant. And I choose the word ignorant deliberately - you don't just lack knowledge, you choose to ignore that which is inconsistent with your existing knowledge, at least on this topic.
Of course, there is a very simple solution to this, but for reasons I doubt you are interested in, you will likely choose to remain in your current state, which is well within your rights.
Yes.
> You don't think all older people somehow understand life better, than you do, just because they have more experience, and, often, knowledge.
It depends on the topic.
On this topic, you have precisely zero first hand knowledge, yet extremely high confidence in your speculative opinion. And seemingly not the slightest curiosity in obtaining facts. It's kind of interesting if you think about it that way don't you think?