What is your cutoff age for ttc?

This is going to be a long post, just kind of venting/writing things out for the simple reason that it makes me feel relaxed. My Husband and I have been trying for about 10 months to get pregnant. After about 4 months of being engaged, I found out I had PCOS and that it would be difficult to get pregnant, so we started trying right after we found out (we got married in February, I found out in October). I told him when I found out that he didn't have to marry me because I knew he wanted kids of his own. Of course, he was appalled that I'd even bring up not getting married. A bit of backstory:  even before we got engaged he knew I've always wanted to adopt. I've known I wanted to adopt ever since I was in high school. He knew that about me very early on and he agreed that he wanted to adopt too. But he also said he wanted at least one child together that was biologically ours. His parents were foster parents for a while and it's a pretty common thing to find lots of foster parents in the town he grew up in. So he's already kind of use to the idea of foster care and adoption. 
Back to what this is about. We knew we wanted to adopt. Like I said, we have been trying to conceive for about 10 months, and I know that's not that long in the grand scheme of things. I'm not the only one in my family that has "lady problems". My sister has endometriosis and was told she would never have kids. It took her 3 months of trying to concieve her son who is now 8 months old and healthy. My other sister has 2 kids and had no trouble conceiving at all. They became pregnant with their first child about 5 months after getting married. My mother realized my husband and I have been married almost 6 months and has decided that we won't ever get pregnant, so now she keeps repeatedly telling us that it's okay if we can't have kids, we can just be the fun aunt and uncle. I get that she is trying to make us feel better, but we want to be more than just aunt and uncle. There have been no adoptions in my family. My family doesn't really see adoption as an option for anything. 
I'm getting a little off topic. Anyways, my husband and I were discussing what ages we would like to be parents by. We decided that we want to completely stop trying for kids by the time I'm 35 and he's 37. That's just our personal decision. We've also been talking and have decided that if by the time I'm 27 and he's 29, if we haven't been able to get pregnant, we want to go ahead and start the adoption process. We are currently a young couple, I'm 21 and he's 23. I'm aware we are young, but if there's a chance we can't concieve, we want to have the opportunity to try for a while. Anyways, thanks for letting me vent/relax about the situation. If you have any tips or advice or want to share your story, I'd appreciate it. :) 

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