What does he mean by being old?

To explain old memes, we must first understand the meaning of "Geng".

Meme, an Internet term, often appears in variety shows. The so-called "Geng" means the point of laughter, and making a joke is to pave the way for the point of laughter. Generally speaking, memes are used for popular things such as variety shows, animations, TV series, etc. The meaning of the word "Geng" has been continuously expanded and extended. It can be called "Geng" as long as a certain time period, as small as a plot episode, or even the fragments that occur in the story, such as "height stalk", "classic stalk", "face-off" "Meme", "Romance Meme", "Creative Meme", "Humor Meme", etc.

An old meme refers to an old joke or plot that has been used many times. "You are talking about an old meme" means "I know everything you said." . To laugh at others in this way is to belittle the other person and at the same time show one's grasp of hot topics and trends. In fact, there are many hot spots and trends on many websites or social platforms on the Internet. They are just picking up other people's comments and don't care about the other party's comments.

Extended information:

As for the origin of "meme", non-famous cross talk actors have the following saying:

In the entertainment industry, people often hear people say: This gag and that gag , this is an old joke. People in Hong Kong and Taiwan said it was okay, but mainlanders later followed the same example, which made me feel so uncomfortable. For professional reasons, I am a germophobe when it comes to languages. The so-called stalker is 叏. 叏 refers to funny and humorous language and actions. There is also a pronunciation of 铏, which in ancient Chinese means very or ruthlessly. But reading it as 叏 is a common way of saying it.

It is often said in backstage chats at the opera industry: There is someone here for you to listen to. Due to historical reasons, many Peking Opera artists moved to other places and brought a lot of vocabulary with them. Not everyone can read 哏 accurately, so they misread it into a joke. As time went by, "Geng" was brought back to the Mainland from Hong Kong and Taiwan, and it became a word that seemed very foreign. The pronunciation of "Beijing" in Chinese is quite funny.

Reference: Baidu Encyclopedia-Geng