Late diagnosis of ADHD or autism in women, especially those in their 40s, is increasingly recognized as a significant phenomenon linked to hormonal changes. Estrogen and progesterone are not just reproductive hormones; they play crucial roles in brain function. Estrogen acts as fuel for executive functions like attention, planning, and working memory, which are often areas of difficulty for individuals with ADHD or autism. Progesterone serves as a regulatory 'brake,' helping control impulses and social behaviors. As women approach perimenopause and menopause, the decline in these hormones can diminish their ability to mask or camouflage neurodivergent traits. Masking is the process of consciously or unconsciously hiding symptoms to fit societal norms, often involving high cognitive effort. With the reduction of estrogen and progesterone, many women find the effort to maintain such masking unsustainable, leading to more visible symptoms and a higher chance of receiving an accurate diagnosis later in life. This hormonal impact explains why many women remain undiagnosed during their younger years when estrogen and progesterone levels are higher, allowing them to effectively mask their symptoms. Understanding this connection helps reduce stigma and promotes better support strategies tailored to women's unique neurological and hormonal experiences. If you are a woman in your 40s or beyond who has recently been diagnosed or suspects you might have ADHD or autism, it can be helpful to explore how hormonal transitions like perimenopause affect your cognition and behavior. Consulting healthcare professionals who are knowledgeable about neurodiversity and hormonal health can facilitate more personalized care. Sharing experiences under hashtags such as #adhdinwomen, #autisminwomen, and #perimenopause provides community support and empowers women navigating these complex changes.