I’m not blonde, but there’s something amiss in my brain -— high IQ, but not only is math a mystery to me, I also remember dates wrong. There’s a word for that phenomenon, but I can’t remember IT, either.
I’m like you, although I’m not bad at math. I could never remember my parents’ birthdays, still can’t. I get my son’s birthday confused with his mother’s because one is Sept 13 and the other is Sep 20. I didn’t know it was a condition, though. Getting older makes it worse.