<human>: Give me a shortened version of the text

I love my girlfriend. Maybe not as much as she loves me at the moment, but I find that these things always have an ebb and flow to them. We've been dating a bit under a year. Anyway, we've been apart for over a month for the summer while I'm at a study program abroad. It has given me time to think about my life, my goals, etc. She and I both are in a very competitive performance industry--it is likely that I won't have any semblance of financial stability (or spatial stability, really, since travel is a key component of this career). I know I want to have kids. But I'm worried that by the time I will be able to, she might be too old. I know I'm thinking ahead a lot, since we haven't been dating that long, but I don't want to waste her (or my) time continuing a serious relationship if I know that eventually I will leave this person. It sounds kind of emotionally brutal, I know, to be judging out compatibility based on her biological clock, but there it is. What should I do? I've spoken to her about these concerns before, but she doesn't think it's a legitimate thing... She believes that now it's entirely normal to have children in your late 30s. I've always believed that it's less likely and more prone to problems if people wait so long before trying to have children.
<bot>: I am dating a woman who may be too old for me to have children with when I'm ready. Should I end things now before they get too serious?