How can a 18yo look like a boy?

An 18-year-old can appear boyish through their choice of clothing, hairstyle, and overall grooming. Wearing more casual or androgynous styles, such as baggy jeans, t-shirts, or sneakers, can contribute to a youthful appearance. Additionally, a shorter hairstyle or less pronounced facial features can enhance a boyish look. Finally, body language and demeanor can also play a significant role in how one is perceived.