Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Arrhythmia? ?
    ### Response:
    Arrhythmias are very common in older adults. Atrial fibrillation (a common type of arrhythmia that can cause problems) affects millions of people, and the number is rising.
                
Most serious arrhythmias affect people older than 60. This is because older adults are more likely to have heart disease and other health problems that can lead to arrhythmias.
    