a moment in time where your brain fades and you cannot remember what you were saying, or cannot recall the meaning of something important. similar to a blond moment, but caused by age rather than hair color. sometimes occurs due to being impaired by weed, alcohol, or meds
me: yo, what was the name of that chick I banged in your parents bed? the hot one with the great titties? shit! what was her name?!
you: damn dude, you having a geritol moment? that was Stacy and she was outrageous!!