My husband was diagnosed as dyslexic aged 38....when he was unable to pass important medical exams ( they were multiple choice and he couldn't retain the information in his short term memory long enough to then complete the answer grid! - in spite of IQ of 160! )I was diagnosed with dyslexia later in life when I was 27 and 2nd year at uni. It can be harder to pickup in girls as we are natural problem solvers and find ways to work around a problem. It was also discovered that I has Irlens syndrome which can accompany dyslexia. So if I'm reading off a white background the words don't stay in place and can be blurry, but if I use a blue background the words stay in place, are sharp and more focused so I read faster and better.
He ended up having a complete nervous breakdown and giving up his medical career because of his inability to pass these membership exams
luckily his long term memory is incredible and he then returned to Uni to do a post grad law degree and is now a Barrister!
Our 3 children all have a variety of dyslexia/Irlens/ dyspraxia/dyscalculia/ADHD/dysgraphia.....
I've been through so much with them all, attending assessment centres / educational appeals/ educational psychologists....you name it I've been there!
Younger daughter was only diagnosed with ADHD last year aged 24 after struggling with anxiety for several years and wondering why her mind wouldn't switch of sometimes
However all 3 have now got degrees from top Unis and are excelling in their chosen fields...you just have to ignite an interest which appeals to their strengths and try not to compare them with their peers (in fact my eldest was told she'd be lucky to get a few GCSEs and she now has and MA, MSc and is just about to embark on PGCE in primary education as she wants to inspire youngsters who may otherwise end up on the rubbish pile of education)