I don't think it could be 'old timers' when you write so poetically on your chicken threads.
I personally believe-- for women anyways when the placenta leaves the body after childbirth it draws with it brain cells in some fashion and we all know they cannot be reproduced. Mothers become forgetful, will leave car keys in places unknown, will put the whites in the dishwasher, and try to determine where the delicate cycle is for 5 minutes or more, forget where your parked at Walmart-- that's a killer right there--. And you can blame it on lack of sleep but then through the years getting three people ready in the morning instead if one may be a factor. Making sure there's lunch money, everybody has brushed the barnacles off their teeth, basketball socks and shoes are packed, etc, etc...
I don't know why us mothers are forgetful really.