Advice

So my bf and I have been together since high school. We don't live together. But have been together for years. Never broken up. I'm about to be 29. I'm freaking out cause what if by the time we get married I can't have kids anymore? What if we never get married. He wants to get married but our families are too freaking needy that we just keep putting it off. So now I'm crying in the middle of the night freaking out. Any older ladies have any advice?