Now I believe that fortune-telling and geomantic omen are basically people born before the 1980 s, but not after the 1990 s. Will it be lost in 30 years?

No, it's because fortune-telling Feng Shui has its correct side and reasonable living space, which has more or less guiding significance in terms of ideas, ethics and real life. It's not that they don't believe after 90, because they haven't had any trouble. Once a friend can't help, we must find out what is going on. In the past, Chairman Mao refused to burn incense and worship Buddha for fortune telling, and he never stopped!