This came up for me today as part of a wider debate.
I have a diagnosis of ADHD which I obtained 2 years ago at the age of 58.
No-one who has expressed an opinion in my circle of family and friends accepts that either ADHD exists or that I have it - so my AIBU is to ask if others who are diagnosed have a similar experience or does anyone take it seriously?
I have avoided sharing my diagnosis at work since there seems to be such a widespread disbelief in it.