You know, sometimes you will meet someone old at a family party and have a little chat. At the beginning, you will find out that they seemingly have something to tell. But eventually, you will know they are so-called “solidified brain”. Because such people already made their brain solidified, which is nothing new in their brain, act like an old-fashion tape recorder and play their well-known old songs again and again and again.
That’s a bad feeling, especially when you must stick on the conversation for a while.
Anyway, my point is we have to frequently update our knowledge and keep thinking when we get older. Then we can let our next generation feel better when we talk to them. (Even though that’s not the only reason.)