Can I go pro at motocross?

I'm a 18 year old girl going on 19 this May 4th,and I'm wondering if I'm able to go pro at "Motocross racing" I used to ride dirt bikes,I had a 70cc cruizen dirt bike,and than I got a full race bike called a "Yz85" and the last time I road dirt bikes was 2 summers ago,NOT counting... show more I'm a 18 year old girl going on 19 this May 4th,and I'm wondering if I'm able to go pro at "Motocross racing"
I used to ride dirt bikes,I had a 70cc cruizen dirt bike,and than I got a full race bike called a "Yz85" and the last time I road dirt bikes was 2 summers ago,NOT counting this one.

Also I was pretty good at my "Yz85go" I could climb hills, and jump.
I started riding dirt bikes when I was "13" and than I started riding my "yz85" when I was 15.
Than I sold my dirtbike in may of 2010.
Also I don't have a dirtbike anymore,and I have NEVER raced before,so if I got a dirtbike from couple of years from now,would I beable to go pro at motocrossing?If so,what age?
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