Im 31 and ALWAYS get bad diarrhea during the first 1-2 days of my period. I have read this is a normal response to a hormonal surge in the body. If you have never experienced this before it could be because, as you age, your body is just reponding differently to these hormones. I would make an appointment with your gynocologist - prehaps there is something that can be done to help alleviate your symptoms.
I'm 33, and always have the 'scoots' during my period, and I know several women who also experience this...The first couple days are definitely the worst....In fact, at one point, I was afraid that always wearing tampons was the culprit. When I switched to pads, nothing changed. Maybe your just lucky that this didn't happen to you until you were 50!
If you are terribly concerned, you could probably rectify this on the phone with your ob/gyn....or even the nurse may be able to help you....otherwise, keep some Immodium around so that you don't get so 'wiped out!' Good luck, it sucks.....
i get diarrhea during my (virtually nonexistent) periods on a monthly basis. ever since i had a depo shot (first course of treatment) then surgery to remove endometriosis and persistent ovarian cysts, and had an iud implanted, i don't have "normal" periods but always have diarrhea and sometimes have very severe, incapacitating cramps (less frequently since my surgery). while the diarrhea may be symptomatic of increased hormonal levels, it also may be symptomatic of endometriosis (largely because your abdomen is irritated by the internal bleeding that comes with the endo implants). i would suggest having yourself checked out for endo if it is a persistent problem for you (the only real method of diagnosing endo is a laproscopy). best of luck!