What hair pattern occurs most frequently in young adults and exhibits relative straightness across the forehead?

The squared hair pattern is characterized by a straight appearance along the forehead and often appears in younger individuals. This pattern is frequently noted for its uniformity and can give a structured look to hairstyles. In young adults, this straightness is prominent, making it easy to identify and often considered a clean-cut style. The squared pattern typically conveys a youthful, organized aesthetic, which may contribute to its prevalence in younger demographics.

In contrast, other hair patterns like retro, wavy, or layered do not fit this description as closely. The retro style might show more of a curve or wave, while wavy patterns introduce bends and curls that differ from the straightness associated with the squared style. Layered hairstyles, on the other hand, emphasize differing lengths to add texture and volume rather than maintaining a consistent straight appearance at the forehead. Thus, the squared hair pattern stands out as the most accurate choice for the question.