It's not at all that i fell in love with the wrong person, because i don't feel he is the wrong person at all, our only "problem" if any in our relationship is the age gap. As a dad, seeing that my daughter brings home a 40 (almost) year old guy... How important is the statement "age is just a number" to you?His parents know about us and they like me, but i know it will be a big issue with my parents. Because you are going to have to solidify your belief in that statement to sell it to your parents.Does my mother agree with the choice i am making no she doesnt, but she accepts it and supports me no matter how much she disagrees. They never approved my choice of course in diploma (graphic design).I mean why are you going to just avoid the man your daughter is with just because of the age? Saying that what I did is rubbish, my future is dim, my assignments was never "a thing" They never respect my choice, and yet my boyfriend was so work out on the approval part. A little piece of advice, Understand you daughter, tell her to bring him home often so that you could observe their relationship. Listen to your daughter about what kinda man he is to her. It could be his a man worth you daughter's love, it could be not. If he's a bad guy, she'll feels it, and she'll let you know her concerns.
Best thing to do is to just tell them and get it over with.Your BF is not in a relationship with your parents.