Is it possible to get or develop dyslexia as a teen?

Unlikely: Not really unless there is something new occurring with your brain function.Generally one is born with dyslexia.It may show up later because the body is able to compensate with other strengths.

Only if the teen has: had a brain injury or meningitis, or other central nervous system illness. Dyslexia often presents in a child with early expressive language delays, trouble learning the sound(s) of letters in preschool & difficulty "sounding out" words. A teen with new-onset difficulty in reading comprehension needs to see his doctor & a neuropsychologist or psychologist for diagnosis & get educational supports.