That risk is not pronounced past 30, but 35. Adding to that, it negligible. It's not like 50% of babies have issues, it's just that a greater percentage do compared to women in their 20's.
Most families these days are started by parents in their 30's.
I wouldn't even consider starting a family later than 35. And look at 45! More than a 1 in 33 chance you will have a child with Down syndrome (Trisomy 21) after 45...those are definitely not gambling odds.
Those numbers are far too small to base such a life changing decision on.
And this kind of risk to the baby is not nearly as serious as a risk to the mother. You can always try again. These are the stats you should be considering.
Most families these days are started by parents in their 30's.