Hi. My husband is 62 and started having Afib events about 8 years ago. The first 2 times he had Afib, he went to our local emergency department and was cardioverted. ( his normal heart rate was about 55 or 60; in Afib it went up to 180. ) The third time he had Aviv he stayed home and it resolved after several hours as he rested and relaxed. Our doctor told us some people live in Afib, and carry on as usual. My husband suggested you could seek medical attention at 160 or higher, if you're comfortable. Always ask your doctor.