my bf's bday is on nov 10,1989 and mine is on jan 22,1991,we are 4 yr & half,are we compatible?

Although your compatibility rating is not high, it doesn't mean that you cannot be a good match.
You two often have different opinions towards the same thing. So in the furture life, try to understand and respect him are very important for you. In this way, the lovelife will become closer and stabler.