Where does shaving beard make an adult man look younger bullshit?

As we all know, little boys are not supposed to have beards. If a little boy could grow beard, of course that would make him look older because little boys are not supposed to have beards.

But when a man is adult, he can grow his beard. It is the nature of an adult male. By the age of 21, beard development is 100 percent completed in males, which means a 21 year old male has his fully developed adult beard so it is the nature of the male to have 100 percent developed adult beard. Why? Because a 21 year old is 100 percent adult physically. After this age, we don't grow up. We just get older. So having beard means you are an adult male, not a little boy.

And the last, if a man is over 21, having beard will never chance my estimation of his age unless he is growing a gray beard. Because having a gray beard is the symbol of being a old man instead of being an adult man.

Having black beard is the symbol of being an adult male.

Having gray beard (or white beard) is the symbol of being an old male.

This is the way I see it. Unless someone who is over 21 has the face of a 16 year old teenager without beard, that won't chance my age estimation. Someone who looks 21 without beard won't look 26 with beard, considering he is growing an adult beard (black beard) instead of growing an old beard (gray beard).
Where does shaving beard make an adult man look younger bullshit?
Where does shaving beard make an adult man look younger bullshit?
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