For a 50-year-old, Tik Tok is a social platform mainly used by young people, so there may be some content that is not suitable for them. However, if a 50-year-old man is interested in sharing his preferences for Tik Tok, he can consider the following aspects to fill in Tik Tok preferences:

1. Hobbies: He can fill in his favorite music type, movie type and travel destination to show his personal taste.

2. Knowledge and skills: He can share his knowledge or skills in a certain field, such as music, health and photography.

3. Life experience: He can share some life experience and wisdom, such as medical care, family education and workplace life.

4. Current affairs hotspots: He can choose to pay attention to some current affairs hotspots, such as social news and scientific and technological progress, and share his views and opinions on Tik Tok.

In short, 50-year-old men can use Tik Tok platform to show their interests, knowledge and experience, and share and communicate with people of other ages. But he also needs to be careful not to involve content that is not suitable for his age and keep a style that is consistent with his age.