Menstrual Bleeding..Clots Only

Patient: I am 53 yrs. No children. Never had any typeof birth control. My cycle has began to come at intervals..no cycle for two months ..then it comes, but when it comes, it is just clots…and it will only las for day then stop. This has been going on for the past 10-12 months…I have no pain…no cramps…What does this mean…

Doctor: