Does advanced maternal age over 35 specifically raise autism odds?

PostedDecember 2, 2025

UpdatedDecember 2, 2025

ByMy Patient Advice

Author: Hannah Smith, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Numerous studies have explored whether maternal age over 35 and autism risk are closely linked, and findings suggest a modest but measurable association. While maternal age alone does not determine outcomes, reaching the maternal risk threshold of 35 years may increase the likelihood of autism due to age-related biological changes and pregnancy complications.

Research into maternal age over 35 and autism often reports an increased odds ratio, meaning the statistical likelihood of autism is slightly higher in children born to older mothers. The reasons behind this are complex and involve genetic, hormonal, and environmental influences.

Understanding the Numbers Behind the Risk

Here’s how maternal age contributes to autism research and risk analysis:

Maternal risk threshold and biological changes

Crossing the maternal risk threshold of 35 is associated with changes in egg quality, hormone regulation, and higher chances of conditions such as pre-eclampsia or gestational diabetes. These factors can influence foetal development and neurological outcomes.

Interpreting the odds ratio

Studies show that the odds ratio for autism rises incrementally with each additional year over 35, though the overall risk remains low. It is important to remember that most older mothers have healthy children, and this statistic reflects population-level trends rather than individual outcomes.

The connection between maternal age over 35 and autism is just one part of a much wider picture. It should be considered alongside lifestyle, genetics, and access to quality healthcare.

Visit providers like Autism Detect for personal consultations to understand how maternal health and age-related factors affect 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.