Does age difference matter?

Me and my boyfriend are 11 years apart. He is 30 and I am almost 19. We love each other and we've already stablished we are gonna spend our lives together. I don't think age matters but sometimes I do feel like I don't want him to be too old when we have kids. We are currently in a long distance relationship which is the hardest thing I have ever done. We've been apart for 4 months now and won't be together until december. We are both from argentina but I came to the us to study and he stayed in argentina. I just hope the age difference and the distance wont break us apart. I cannot imagine my life without him