Why don't you want to tell your fortune when you are under 25?

There are two reasons. One is that people under 25 are mostly immature. If their numerology is not good, it will affect their studies and their pessimism about the future.

Second, many people under the age of 25 are ignorant, have never experienced twists and turns, don't believe in horoscopes at all, and are self-righteous. It makes no sense to tell fortune with these people.