Was ADHD Built for Boys? Why Thousands of Women Are Being Diagnosed Decades Later
For decades, ADHD was understood through the boys who couldn't sit still. But as growing numbers of women receive diagnoses in midlife, a deeper question is emerging.
Special note: My book The Billion Dollar Blindspot is now available to purchase. Grab your copy and get your bonus chapter here
Key Takeaways
ADHD has historically been studied and diagnosed through a predominantly male lens.
Many women with ADHD are not diagnosed until their 30s, 40s, or 50s.
Late ADHD diagnosis in women is increasingly being linked to midlife hormonal changes and perimenopause.
ADHD in women may represent one of the largest overlooked opportunities in women’s brain health.
Imagine spending forty years believing something is wrong with you. Not seriously wrong but just enough wrong that you notice it.
You buy the planner. Then another. You create elaborate systems to stay organised. You write lists, set reminders, colour-code calendars, and leave yourself notes around the house. You arrive early because you’re afraid of being late. You overprepare because you’re afraid of forgetting. And you work twice as hard as everyone else to keep all the plates spinning.
From the outside, people think you have it together but inside, you are exhausted. You wonder why ordinary life seems to require so much more effort for you than it does for everyone else. Then one day — often in your forties or fifties — someone asks a question that stops you in your tracks.
Have you ever been assessed for ADHD?
At first, the suggestion seems absurd. ADHD is what little boys have. Not women with careers. Not mothers. Not executives. And certainly not the person who spent decades holding everything together through sheer force of will.
And yet, increasingly, that is exactly what is happening.
Women in their thirties, forties, and fifties are being diagnosed with ADHD in record numbers. For many, the diagnosis arrives with an unexpected mixture of emotions: relief, because finally there is an explanation; grief, because no one noticed sooner; anger, because years spent blaming yourself can never be returned. Running through almost every one of these stories is the same phrase in different forms.
“I thought I was lazy.”
“I thought I was broken.”
“I thought everyone else found this easy.”
“I thought it was just me.”
But what if it wasn’t?
A few weeks ago, I wrote about Ambien, a sleep medication prescribed to women for nearly two decades at doses calibrated almost entirely on male data. It took regulators the better part of twenty years to acknowledge that women metabolised the drug differently. The lesson was not that researchers were malicious. It was that assumptions, once embedded in systems, become invisible. And once invisible, they stop being questioned.
The more I read about ADHD, the more that pattern began to feel familiar. For decades, the public face of ADHD was a young boy who couldn’t sit still; disrupting class, forgetting homework, bouncing off the walls. He was the child teachers noticed. The child parents worried about. The child researchers studied.
But what about the girls? The ones who daydreamed quietly, compensated, internalised and learned to hide their struggles instead of acting them out. If the condition was defined around the children who were easiest to notice, what happened to everyone else?
The question most coverage asks is: why are so many women being diagnosed now? The answer offered is usually awareness. Social media. Reduced stigma. Better clinician training. Those explanations may be true, but the more stories I encountered, the less convinced I became that this was the whole story.
Many women who receive late diagnoses describe not a gradual increase in awareness but a sudden collapse. A point in their forties when the systems that had held everything together for twenty years seemed to fail all at once. The lists stopped working. The calendar couldn’t keep pace. The effort required to function began exceeding what was available.
For a significant number of women, that moment appears to coincide with perimenopause. That coincidence is not random, and it is not well understood.
But it points toward something the awareness narrative misses entirely: that for many women, the real question is not why they are being diagnosed now.
The real question is what changed in their biology that made the invisible finally visible. Perhaps the real story is not that women are suddenly developing ADHD. Perhaps the real story is that they were always there and we never learned how to see them.
Over the coming weeks, I’m going to follow that question wherever it leads.
Into the history of ADHD and how it became known as a boys’ disorder.
Into the experiences of women who spent decades undiagnosed.
Into the emerging science of hormones, cognition, and midlife brain health.
And eventually, into the capital markets themselves.
Because if millions of women have been invisible to a diagnostic system for forty years, the implications extend far beyond medicine. They touch research priorities, innovation, healthcare delivery and investment.
Most of all, they force us to confront a possibility that sits at the heart of every blind spot. Sometimes what appears absent was there all along.
The first piece drops next week. If you have a personal experience with ADHD (medication, diagnosis or treatment), I’d love to hear from you.
Series Overview: This article is Part 1 of an investigative series examining ADHD in women, late diagnosis, perimenopause, hormonal influences on cognition, diagnostic bias, women's brain health, and related healthcare innovation and investment opportunities.
That question sits at the heart of my new book, The Billion Dollar Blindspot. The book explores how outdated assumptions shaped research, innovation, and investment in women’s health and why some of the most important opportunities in healthcare may emerge when those assumptions begin to break down.
I’m grateful that the book recently reached #1 New Release on Amazon in its category, a sign that more readers are beginning to engage with these ideas. Because this conversation is ultimately about much more than menopause, hormones, or even women’s health.
It is about what happens when we finally start looking at the world as it is, rather than as it used to be. If you’d like to explore these ideas more deeply, you can find The Billion Dollar Blind Spot on Amazon.
Disclaimer & Disclosure
This content is for informational and educational purposes only. It does not constitute financial, investment, legal, or medical advice, or an offer to buy or sell any securities. Opinions expressed are those of the author and may not reflect the views of affiliated organisations. Readers should seek professional advice tailored to their individual circumstances before making investment decisions. Investing involves risk, including potential loss of principal. Past performance does not guarantee future results.
My best friend pointed it out when I was 50, ~5 years ago. Pandemic was winding down, my ex-husband was becoming increasingly emotionally abusive (which was obviously all my fault, or so I somehow managed to believe at the time), I overcommitted at work, felt like I was parenting terribly, and was exhausted. Five years later I tried a med that worked wonders. Divorced now ex within 6 months of starting it. Disentangling anxiety and ADHD was key for my being able to move forward.
I was diagnosed at the age of 33. My diagnosis came about because I entered outpatient treatment for my eating disorder, and my care team noticed that I was struggling with things like interception (noticing hunger and satiety cues), remembering to eat, and remembering when and what I last ate.