When chatting with the elderly, don't talk to yourself, especially some scientific and technological products that the elderly don't understand and are not interested in. When people are old, they like nostalgia, especially talking about the past. As a junior, all you have to do is listen. If you can put in a few words properly, the old man will think that you like his deeds and have a better impression on you.
When communicating with the elderly, you must be patient. Older people always talk and sometimes forget everything. I have told you clearly for n times, and then you forget that your ears have to accept it again. Please understand this situation, everyone will have a sunset, and respecting the elderly means respecting yourself in the future.