I'm 48 and have had peri for about eight years. It seems that in the past few months I've really noticed the bad memory thing a lot more, even though I'm using bioidentical hormones. It seems to sort of come and go, probably with my own hormone fluctuations. I also seem to do worse if I haven't slept well.
I posted a "chuckle" a while back about leaving my groceries in the trunk of my car for 3 hours after getting home. I was able to laugh about it, but it bothered me also because I just couldn't believe that I did that! This is beyond just being forgetful.
Hope you continue to feel better