Martha Plimpton 'not ashamed' of her ADHD After being diagnosed with the condition in her early-50s, actress Martha Plimpton has declared she is "not ashamed" of her ADHD. 7 September 2025 Martha Plimpton is "not ashamed" of her ADHD. Martha Plimpton is 'not ashamed' of her ADHD The 54-year-old actress received her diagnosis of the condition in her early 50s and has now said getting it was a "huge relief" instead of a worry as it helped explain her behaviour.