Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) CHMP2B-related frontotemporal dementia ?
    ### Response:
    CHMP2B-related frontotemporal dementia is a progressive brain disorder that affects personality, behavior, and language. The symptoms of this disorder usually become noticeable in a person's fifties or sixties, and affected people survive about 3 to 21 years after the appearance of symptoms.
    