If you want facts, you will get them.
The risk of having a child with Down syndrome depends on the age of the mother. For women under the age of 25, the likelihood of having a sick child is 1/1400, to 30 - 1/1000, at 35 years the risk increases to 1/350, at 42 years - to 1/60, and at 49 years - to 1/12. However, since young women generally give birth to much more children, most (80%) of all Down syndrome patients are actually born to young women under the age of 30.
The fucking. It is only the age of the mother, the father may be at least 90.
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Different sources give different assessments of the risks for the mother. For example, the English-language Wikipedia reports a probability of 1 to 44 for the age of a woman at 50. Plus, the influence of father’s age on the likelihood of having a child with Down syndrome is now being analyzed and seems to be there too.
In addition, there is such a thing as prenatal screening - you can determine the pathology in advance and yes, interrupt such a pregnancy.