Dreaming of a young man typically indicates the presence of an enemy in your life. If the young man is someone you know, you can discern his strengths, weaknesses, or deceitful nature through his behavior and character. This dream serves as a warning that someone around you harbors hostile feelings towards you. Therefore, you should remain vigilant and pay attention to your relationships.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Young man" (page 485).
An unknown young man in a dream represents an enemy. If the young man is known in the dream, then whatever strength, harshness, weaknesses, deceit, perfidy, or character he displays, they denote the same character in wakefulness. Walking behind an unknown young man in a dream means pursuing one's enemy and conquering him. If one meets an unknown young man whom he dislikes in a dream, it means that such an enemy will surface and people will abhor him. Ifone happens to like him in the dream, then it means that he will face an enemy whom most people like and sympathize with. Ifa young man sees himself turned into an old person in a dream, it means that he will suffer major losses in his life. A young man or a teenager in a dream mostly represents an enemy, for a teenager rarely respects or heeds the advice of his peers. A young man in a dream also represents deceit, betrayal, energy, or stubbornness, though he also could represent blessings and gratitude.
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.