Nothing is wasted in faith. One never loses out. Please be confident that all your efforts to help others and promote Buddhism are accumulating immense treasures of good fortune in your life. This is what is meant by inconspicuous benefit.
There is no retirement age in faith. Sincere faith never ages. Those who exert themselves for the sake of the Law are ever young. Our heart is what matters most. Let us strive to the end of our days for kosen-rufu.