My boyfriend wants a baby!

I'm 19 and my boyfriend is 28. Huge age difference, I know, but my sister and my cousin hooked us up. We have sex regularly (everyday, sometimes twice a day) and while speaking to him one day he said he wants a lot of kids. He hasn't had any kids yet, and he refuses to wear condoms. I love him so much, but I'm just not ready to have kids yet because I plan on finishing university. He wants kids really badly but I just don't want to dissappoint him and decline. Advice?