You may be 40 years old, but could your brain already be showing signs of accelerated aging? New research involving more than 18,000 people suggests that the answer may depend on much more than genetics or your date of birth.

This article is intended for educational and informational purposes only. It does not provide medical advice, diagnosis, or treatment. Brain-age estimates are research measurements and should not be interpreted as definitive evidence of neurological disease. Consult a qualified healthcare professional for persistent memory problems, cognitive changes, or concerns about neurological health.