I think everyone can be a wise . If they perform as Buddhist principles.
A wise person is someone who is extremely capable, and who's capabilities stem from a deep understanding. Understanding is measured by its depth, and depth is achieved with persistence and time.
Hence, wisdom increases with age, or at least that is the common perception.
If enough people tell you they think you are wise, then that's a pretty good sign. Wisdom is not something you can confer on yourself. It is something you earn by being helpful in your advice to others.