Translation:I would have had children, if I were not so old.
Yes. Here is a reference: https://www.englishpage.com/conditional/pastconditional.html
The other commenters have correctly stated that the English sentence is completely wrong -- it needs to be rewritten either as a present condition contrary to fact or as a past condition contrary to fact.
So let me just add that there is also the so-called mixed condition:
"If I had not gotten a divorce ten years ago, I would be celebrating my golden wedding anniversary today."