Why is it that older sisters tend to be less attractive than their younger sisters?

Anonymous
Why is it that older sisters tend to be less attractive than their younger sisters?
I've noticed this a lot. Whenever I see two sisters or more, the first born daughter is always less attractive than the younger one (s).

This of course doesn't mean that the elder sister is ugly, but she isn't AS pretty as the younger sister.

In some rare cases, the older sister is prettier than the younger. But like I said, in rare cases. It's not common to see that.

I know this from experience as well. I am an older sister. I am the first born, and I have 6 younger siblings. They are all prettier than me, I've been told that too. They all look like models (I'm not over exaggerating. They literally have the features that a model is required to have in order to be a model.) and I am average/below average depending on who you ask.

Of course beauty is subjective. And sometimes an elder sister who is considered to the majority of people less attractive than her sister, can be seen as more beautiful than her sister. But to the average person she is considered less attractive.

I'm just curious why it is often that the elder sister is less attractive than the younger sister. (The younger sister has a more beautiful face than the older sister) And I'd like to hear you guys thoughts on why this is!
Why is it that older sisters tend to be less attractive than their younger sisters?
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