Nah, I don't worry about biological clocks and neither should any one of you
My parents married almost sixty years ago and had their first when my mom was 19 and their last when she was 47. They thought maybe they should have kept having more, lol. She had little old me at 38 and four sisters afterwards. Yes, they wanted all of us. We were HARD working farmers:)
Anyway, young or middle aged, you shouldn't worry about it to much but try and find a compatible mate that would help you raise the little rug rats in the Catholic faith versus worrying about if you can or cannot have children. I think the first plan should start with a compatible mate to help YOU get to HEAVEN and let God do the rest.
There are more times when even young couples have fertility issues that would make great parents even at a very young ages or every one risks complications with birth defects and so none of us are full proof there, but you half to have faith in what God wants of you.
Adoption wouldn't be all that bad for anyone, young and/or middle aged. It is all in God's plan and having faith in yourself and more importantly finding a compatible mate.
So don't sweat the petty