Same thing happened to me at age 55 (I'm 57 now). I didn't think much of the spotting until I realized it wasn't stopping--I went six months like that until I finally went to my gyn. He did a D&C and found I had endometrial cancer!!! I was stunned!! Had a hysterectomy and thank goodness, it was not an aggressive cancer and had not spread. I opted not to go for radiation since I was assured it was non-aggressive. However, 18 months later, I started spotting again and rushed to my surgeon--he found my cancer came back--superficially--he removed it in his office and I had 28 weeks of external radiation and five weeks of internal--finished all of my treatments this past September. Now I have to be examined every three months--and I go for a CAT scan next week (just to be extra careful). I have hope that my cancer will not come back, but am seeing doctors a lot the next few years to make sure that if it does, I will catch it early.
I don't want to scare you, but I want you to GO TO THE DOCTOR and have the spotting checked out--DO NOT WAIT like I did.
God Bless and best of luck!!!