Our manager said that she would resign soon and wanted me to take over her job, but I was very nervous. What if you don't do well?

In the field of management, there is a "Peter principle" that you must know. Every manager knows the trick. He told us that everyone would eventually be promoted to his incompetent position. If a person keeps improving, the final result will be a great waste of human resources. Since your current manager chose you, she still appreciates you. What you may lack is confidence, just the courage to try. Cowardice and timidity will only make you lose more opportunities, but in today's highly competitive society, it is very difficult to win an opportunity through your own efforts. Now, it seems that a pie has fallen from the sky. If you don't pick it up, you will be knocked unconscious by it. A sudden promotion will definitely take a period of adaptation and transition psychologically. You need to run in with your position again and improve the job matching again. And this is an excellent opportunity for you to cultivate and test your abilities. Put aside all scruples and go into battle lightly. Don't think about age. Martha is valuable, but is NPC still valuable? For example, if you are not good at it, think about our feudal society. An 80-year-old minister had to kneel to an old emperor. I don't need to tell you this truth, and you will understand the difference in status. Finally, I wish you success in employment and career in by going up one flight of stairs!