In my studies of educational theory, I came across the concept of "The Tiger-Hunting Curriculum". Broadly, this describes a curriculum or body of knowledge that has become moribund by being rooted in the past and which has failed to adapt to new knowledge. For example, I was taught in the 1950s that an atom was the smallest, indivisible particle of matter.
My physician daughter-in-law has pointed out that in her discipline, what was sound, true and relevant last year may be totally reversed this year as the result of new research or events such as the current pandemic. I know that she works constantly to keep up with the most recent knowledge. If doctors didn't do this we'd still be in padded cells and straight jackets. This applies equally to other areas of knowledge, of course. Knowledge of anything is not static but is in a state of dynamic equilibrium.
It seems to me that the great contribution to human development made by the young is the asking of questions. As elders, our duty is to answer those questions TO THE BEST OF OUR KNOWLEDGE. By implication, we need to check whether our knowledge is still sound, relevant and up to date. I found this the best part of being a primary school teacher: my pupils helped me to learn a lot. Parents and grandparents will have had similar experience.
I remember telling my sons that I could not provide them with answers as to how to live their lives as the world in which they became adults would not be the same as mine had been. However, I did feel my responsibility was to provide them with the sort of questions they should be asking.
As to forums and knowledge: even at the age of 79 and 3/4, there are things I don't know and only this week needed to ask on this what to do about the damage to my plum tree and got some sound, if varying, answers. The thing is, that although I didn't know about something, I did know the best place to seek an answer!
I love that the continuity of human knowledge transcends individual lives. That is why I enjoy the trip reports of parents and children sharing experience and why I am very heartened that there are people like Poppy here to take up the baton of passing on the knowledge of something we all care about.
New blood always welcome.