Is male age or female age more important for autism risk?

PostedDecember 2, 2025

UpdatedDecember 2, 2025

ByMy Patient Advice

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

Debate continues around the relative influence of maternal vs paternal age in autism, as both are independently associated with modest increases in autism risk. But which matters more: an older mother or an older father? The answer, according to recent studies, may depend on the aspect of development being examined.

Researchers exploring maternal vs paternal age in autism suggest that maternal age tends to influence autism risk through pregnancy-related complications and epigenetic changes, while paternal age is more associated with genetic mutations passed through sperm. This has led to deeper investigation of the comparative impact of each parent’s age on a child’s neurodevelopment.

How the Contributions Differ

Here’s how science is untangling the roles of maternal and paternal ageing:

Comparative impact on risk mechanisms

While both maternal and paternal age contribute, studies indicate the comparative impact may lean slightly more towards paternal age when it comes to genetic changes, particularly de novo mutations. However, advanced maternal age often plays a stronger role in pregnancy health, which can also influence early brain development.

Sex-specific contribution to autism risk

The sex-specific contribution of each parent may also vary. Some research shows paternal age effects may be more pronounced in female offspring, who require a higher genetic “load” to exhibit autism traits. Conversely, maternal age might play a more significant role in male outcomes due to in-utero environmental exposures.

Ultimately, both sides of the maternal vs paternal age in autism question provide valuable insights. Taken together, they offer a more complete picture of autism risk.

Visit providers like Autism Detect for personal consultations to understand how parental age and biology 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.