what age you started your very first relationship?

Well, as you can tell from the varied responses you needed to define relationship. I would say all of us had our first relationship with our mother; it is just biological reality. But assuming you meant a significant reciprocal romantic relationship with a non-family member, I would have to say 28. I was a late bloomer. Not to say I didn't have crushes and infatuations with others going back to third grade, but none I could say were reciprocated.