I was born 12/31/1973, he was born 05/12/1978, will the relationship last?

Catherine, he is horse and you are ox. To be honest, these two signs are just a common pair. However, zodiac compatibility isn't the most important factor to your relationship. The key is how you both manage your relationship. If you both love each other and are long for a forever relationship, you both should make great efforts to take care of each other.