What questions are there to ask?
If you are 20, 21 and you are at a party or a club and there's drinking and smoking and shit. You not asking questions unless someone looks out of place. If I am somewhere with weed, cigarettes and alcohol, I think everyonne is an adult. We rolling dice and shit. Playing vulgar music. People are fucking in the bathroom.
You not thinking, "Fuck, there's a 14 year old here in somewhere, I just know it. I gotta be on alert."
You start asking questions when you hit 30 and start feeling a little weird, like you should be at home with a wife and kids and thinking all the 22 year olds just want you for your money and what kind of person are you to still being chasing the cat and whether or not you are corrupting someone's daughter. You'll think this only if you have a conscience.
Once you figure all that stuff out, if you still single and you are out here by 35, you just go places where you won't most likely find a someone under 25. Then you are in prime fucking ages ,you have the most money you will ever have while still being in your physical prime. You are like Dexter. You got rules in place, so no one gets hurts. Everyone is fully an adult, you can be brutally honest and if she ain't with it, she gotta go.