Help with plane ticket?

So, I’m going a few states over by plane, alone. I’m 15, but you can’t purchase a plane ticket under 18 online. Is it fine if we change the birth date that would make the person 18, and then explain at the airport desk the situation? Thanks.
Update: Go answer my recent question. Better explanation.
Update 2: I straightened it out, called the airline. Year is fixed.
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