I was diagnosed at 24
Truthfully, my Traumatic Brain Injury is what led to this diagnosis. I wasn't prepared.
However, it is not as bad as it could be, right? The DSM-5 official definition is "Major Neurocognitive Disorder due to a Traumatic Brain Injury".
This is located under the umbrella term of "dementia"
What happened was that almost 9 years ago, I was struck by a car. It put me in a coma for 3 months and I was wheelchair bound afterwards. My collarbone, hip, rib, and tailbone—all broken. My lung collapsed. I had a 10% chance of survival.
I digress. I'm sorry I have issues keeping my thoughts straight now. But I feel like this is essential, since I'm giving context.
Tldr; my condition classifies as dementia and there is a lot of stigma towards it, probably because of ableism and it was caused by a car crash.