Yes. My math teacher in 10th grade had dyslexia, he just learned to cope with it over time. As far as I know it usually develops as a child or teenager.
If you were dyslexic as a child, then you will still be dyslexic as an adult....there isn't a "cure"....it's a matter of learing to live with it.
Of course, age doesn't matter at all when it comes to dyslexia.