Best you read this ;-) [ maternal age is the linkage ]
Other articles point out that older men with older wives share the risk, but not older men with younger wives.
NET: women over 35 who are pregnant and want to know should get the pre-natal exam.
Full disclosure: I was a physiology major years ago (very close to pre-med curriculum) and have two kids who work in healthcare, PLUS I serve the healthcare industry in my professional role.
May I introduce you a site called Google.