Maybe the problem is
AGE! 
As we get older, I posit, our brains start working along more
comfortable, familiar routes... challenging thought becomes difficult for those worn brain cells, whereas running an old "circuit" is plain easy.
So it's our
brains that are at fault! Bad Brain! BAD brain!
What the heck is my new phone number?
"it's a small world, after all...it's a small world..." License plate on my truck?
"hey, hey, we're the Monkees..." I have whole sectors of my brain that can remember all the words to every song that the Beatles recorded, but don't ask me what was on line 16 of my own 1040 form!! AARGHHHH
Also "Eyes Without A Face" Blechh.