What age did you first let someone else wank you, or you wank them?

Firstly, what age did you first let someone else masturbate you (and I mean of your own free will of course)?

Secondly, what age did you first masturbate someone else?

In each case was it another male, or a girl, and how did you feel afterwards? Did you do it regularly? Was it only done to you the first time, or did you return the favour?