I am also in the 50s. I would think when it is bleeding, it is safer to check with the doctor to see what is going on. Maybe something is wrong since you didn't have it for 3 months. Or maybe the stopping for 3 months had something wrong there... Either way, please see you OB/GYN to see what is going on.
It is not an unusual thing to happen because your hormones decline slowly and you can be very gradually building a lining in your uterus that will eventually be thick enough to have spotting to bleeding. Despite this fact, because it is outside the norm and could be an indication of a problem, I would encourage you to see a gynecologist for an evaluation. S/he will probably order a vaginal ultrasound and do a biopsy to determine that the tissues are normal and there is not an abnormality causing bleeding.
Good luck to you and keep in touch!
Sandy Greenquist, CNM
Menopause Center of MN
We hope you find this general health information helpful. Please note however, that this Q&A is meant to support not replace the professional medical advice you receive from your doctor. No information in the Answers above is intended to diagnose or treat any condition. The views expressed in the Answers above belong to the individuals who posted them and do not necessarily reflect the views of Remedy Health Media. Remedy Health Media does not review or edit content posted by our community members, but reserves the right to remove any material it deems inappropriate.