My answer: Is the classification standard related to age? Reason: Because children begin to recognize by looking at colors, colors have different degrees of stimulation to children's brains and different degrees of sensitivity to colors. For example, red is bright, which will stimulate the child's brain, so the child first has an induction and cognition of red. Secondly, shape is a child's tactile ability. Only when a child can grasp something can he feel the shape. Only in this way can we perceive various shapes. Conclusion: Whether the classification criteria are related to age.

I hope my answer is helpful to you.