More like children when you are in your 50s - some are healthy enough to do it but many aren't. And of course it is much more stressful on your body. With an experienced female, it wouldn't be an automatic "no" but for a first litter a definite red flag to me both as a breeder and as a potential puppy buyer.
OP, there is a lot more required to breeding your GSD than an intact female. You need to share her pedigree - some lines don't do well mixed with other bloodlines and will have a higher likelihood of retained testicles, missing teeth, even cancer and allergies are genetic. You need to know those things about your females family tree before you can start looking for a male and then you need to find out his pedigree with the same info.
Then you need to have proven her in some way. Even a CGC or other test at least shows a minimal effort was put into training and proving her temperament though MINIMUM is the key word.
You also need to have her health tested. As a stud owner, I won't consider a female unless she has her hips/elbows tested and genetic testing for DM is something that should also be done. For example, my stud is a DM carrier. That means I won't consider a breeding with a female that isn't tested "clear" because I won't be party to a breeding that has a chance of producing dogs "at risk" of developing a fatal neurological disease.
I also tend to ask the owners of potential females (if I don't already know them) to see a copy of their puppy contract. I want to know that they have a plan for screening potential buyers and require "right of first refusal" if the puppy is ever to be sold and that they are willing to take back any puppy at any time in its life if the owner can no longer care for the dog.
Then we discuss my stud contract. Payment (cash, pick of litter, when payment is due, etc). How many live births constitute a "litter"? There is a lot of legal background to be covered when breeding. It's not so simple as saying "I have a girl; you have a boy; they will make puppies"