Gender: Female AHA--- Dammit.
And thanks to advances in medical science, I am now a woman!
Go me.
If I remember correctly, you're old enough to do most stuff when 25. When you turn 25 is when you're an adult for real.
If we're going to go with that old tired can't rent a car without stupid insurance joke, I say you're not an adult in the US until you are 35. At that point you can run for President.