Based on the provided reference, the youngest color is blue.
The reference humorously suggests this, then questions the nature of blue in the sky and sea, implying a whimsical and not necessarily scientifically accurate answer. It's important to understand that "youngest color" is not a concept used in color theory or physics. The statement plays on the idea that our perception and understanding of color can evolve.
Therefore, while the answer is "blue" according to the provided source, it's meant to be a playful and imaginative response rather than a factual one.
