My girlfriend is 6 years older than me? Is that acceptable? Or normal? Girls usually never date younger guys?

Im 20yo and she's 26.

The good thing is that she's Asian, so she looks like 18 :P

But do you think its normal?

Why do girls usually never date younger guys?
My girlfriend is 6 years older than me? Is that acceptable? Or normal? Girls usually never date younger guys?
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