Change in periods

Im 52 & for the last 3 months ive been having periods every 12/15 days
just finished well i thought id finished has only the latter of dark brown on pad for a day or so
went the toilet before and it seems to have started again as it red when wiping myself..
Is this normal?

im 40 and mine used to be every 28 days now its 21, in peri periods can get closer together before getting further apart x