I disagree. Forgetting your keys or putting your glasses in the fridge are signs of distraction, not paying attention to what you are doing but probably thinking about what you are going to do next. I’ve been doing this since I was a teenager, many, many moons ago. Altho must say I haven’t done the refrigerator-keys bit. So far! :)
Dementia is when you don’t know what your keys or glasses are for.
You may be right. I was told that Alzheimer’s is when you forget what something like your keys or glasses are for. MIL is getting very forgetful as of late.