How many boyfriends is too much?

My girlfriend has had 28 previous boyfriends. I'm 29. She is 14 and so am I. We have been dating 6months On the first. I love her to death but i just wanna know how much is too much. And we ave made plans for our future. She says I need to be a billionair cuz she knows the house were buying how many kids were gunna have and all that stuff. So kinda off topic but please answer my question. And I'm not gunna break up with her if it is too much. I love her too much. Thanks