Older Female younger male relationship

So I'm 37 and my boyfriend is 30. We connect on a level that is unbeatable I have been looking for some one like him. My concern is that I got 2 beautiful daughters have been married along with other things. My boyfriend has no kids and never been married and is starting a new turn in life he wants kids and to be married which I'm fine with but I don't want to have a child when I'm 39 so there for I'm unsure if I can give him one, he tells me that's ok if I can't and he'll still love me what about when he's 35 and has a different point of view on life