The aim of this research was to establish whether gender and age have an impact on spatial reasoning and its development through the use of 3D modeling. The study was conducted on a sample of 196 children from sixth to ninth grade, of whom 95 represented the experimental group and 101 the control group. The experimental group received 3D modeling training in SketchUp software. Spatial reasoning was controlled in the initial and final stages with a test comprising tasks that required mental manipulation of shapes or objects in images. It was found that 3D modeling does improve spatial reasoning, regardless of gender or age.