Should I ask my friend if he jacks off?

I'm 99.9% sure that he jacks off.

I mean depending on his age he probably does, but why does it matter anyway?

If he's older than the age of 9 and isn't a quadriplegic or in a coma, you know the answer is yes, he does jerk off.

Sure if you want to.

Most people male and female do this. If you ask him about it, doesn't that hint to him that you want to play together. 

If you jack off then he does. Simple.

99% of people masturbate, the other 1%lie about it. Why do you need to know?

Every boy and men masturbates and those who say they don't are liars..You can take a chance if he co-operate for masturbation.Regards..

If he's over 12, he does.   (and likely if he's 11)

why would u ask a guy if he masturbates when most do.