As scientists and teachers we must continue to contribute to the world. no matter how small the impact will be very helpful for someone somewhere. Dedication as a scientist and teacher there is no retire limit age. when we stops learning, then we retires.
So our role is very important because in the past Japan when it collapsed after the Hiroshima and Nagasaki bombs, the first thing that was asked was how many of our teachers? Teachers who print a new generation, so this role is very critical in the life of human civilization.