Is the autism risk higher for parents having babies in their 40s? 

When it comes to parental age in 40s and autism risk, studies suggest there is a modest but noticeable increase in the likelihood of autism in children. Both mothers and fathers in their 40s may contribute to this elevated risk due to age-related biological and genetic factors, though it is important to remember that most children born to older parents develop typically. 

The link between parental age in 40s and autism risk forms part of a broader conversation about late parenthood and its impact on neurodevelopmental outcomes. While the rise in risk is not dramatic, it does follow a consistent pattern seen in multiple population studies. 

Understanding the Comparative Risk 

Here’s what researchers are finding when comparing different age groups: 

Comparative risk across age brackets 

Children born to parents in their 40s show a slightly higher comparative risk of autism than those born to parents in their 20s or early 30s. For fathers, this is often attributed to the accumulation of de novo mutations in sperm. For mothers, the increased risk is linked to pregnancy-related complications that are more common at older ages. 

Late parenthood and monitoring 

Although late parenthood may come with additional considerations, awareness is key. With appropriate prenatal care and ongoing developmental monitoring, many of the risks associated with parental age in 40s and autism risk can be addressed or reduced. 

Visit providers like Autism Detect for personal consultations to understand how parental health and age-related factors may influence your child’s development and how to support effective sensory regulation and comfort. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Advanced Parental Age.

Hannah Smith, MSc

Author

Hannah Smith is a clinical psychologist with a Master’s in Clinical Psychology and over three years of experience in behaviour therapy, special education, and inclusive practices. She specialises in Applied Behavior Analysis (ABA), Cognitive Behavioural Therapy (CBT), and inclusive education strategies. Hannah has worked extensively with children and adults with Autism Spectrum Disorder (ASD), ADHD, Down syndrome, and intellectual disabilities, delivering evidence-based interventions to support development, mental health, and well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.