Until recently, it was often only people who fit the classic stereotype of being neurodivergent that were diagnosed, This is for many reasons and you can find out more about this on National Autistic Society website.
Now, we understand a lot more about neurodivergence and how that shows up for people of all different ages, backgrounds, genders and lived experiences.
Until recently, women and people marginalised for their gender (such as trans and non-binary people) were rarely diagnosed with ADHD and autism in particular. This is why the news often speaks about the large numbers of people now looking to get a diagnosis who didn’t find out until recently that they are neurodivergent.