It is always good to learn and teach new thingsSome people feel that now their learning age is gone and therefore they do not want to do anything new. Sometimes if someone tells them something new then they also feel bad that what other will teach us, we have all learned before.
But according to me, there is no age to learn. Yesterday my father was learning some of the settings of YouTube in mobile from my nephew and that 8-year-old kid was teaching my father in such a good way as if he has been doing it since long.
This process of learning and teaching is always going on, I think when we are teaching anyone, then we are also learning something from that person at the same time.