Does having children later increase the risk of autism in the child?

Yes, having children later in life, particularly for mothers over 40, is associated with an increased risk of autism.

Research shows this risk increases with parental age, with mothers over 40 having about a 51% higher risk compared to those in their late 20s, and fathers over 50 having an increased risk as well, though the association is strongest for maternal age.

While the risk is higher, it's important to note that the overall risk for any individual child remains small.

Maternal age
Mothers over 40 have a higher risk of having a child with autism compared to those aged 25 to 29.
Studies have found the risk increases with advancing maternal age starting around 35.

Paternal age
Advanced paternal age is also a risk factor, with studies showing an increased risk for fathers over 40 or 50.
Some research suggests the effect of paternal age is less pronounced than maternal age.

Grandparental age
One study suggests that the age of the grandfather at the time of the parent's birth can also be a risk factor for the grandchild having autism.

Important considerations
Overall risk is small: Even with the increased risk, the overall likelihood of a child developing autism is low.

Complex cause: Autism has many contributing factors, including a complex interplay of genetic, environmental, and developmental influences. Parental age is just one factor among many.

Multiple factors: Research is still ongoing to fully understand the complex relationship between parental age and autism. It is also influenced by other factors, such as the age difference between parents.