Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) fragile X-associated tremor/ataxia syndrome ?
    ### Response:
    Fragile X-associated tremor/ataxia syndrome (FXTAS) is characterized by problems with movement and thinking ability (cognition). FXTAS is a late-onset disorder, usually occurring after age 50, and its signs and symptoms worsen with age. This condition affects males more frequently and severely than females.
    