Age-related cognitive decline is a medical reality. It is also common.
It does not hit everyone equally, and it may not have hit you at all
Medication-related cognitive decline is also a reality. blood-pressure medications and like can cause problems with brain function to the point of changing one's personality.
ARRRRGGGGGHHHHH!! = voice
why can't you tell the difference between speech and voice = speech
"All the people are so happy now, their heads are caving in. I'm glad they are a snowman with protective rubber skin" -- They Might Be Giants