and forgetting I hope is not a conclusive symptom; if it is, I think I have had these lapses & symptoms my whole life. I am not a doctor just someone mature and with experience in my resume'. 
I had a serious moment decades ago that was a total lala land thing. I was in the pax seat with a first date and I looked down at my shoes and I had slipped my feet into two different shoes.
With the correct left/right configuration at least. And sort of the same color, but very obviously not a matching pair. Egads, I was so embarassed but I managed to terminate the date gently without the date noticing my shoes.
I don't think your supposed "moment" qualifies completely for a dementia slip. I and others I know have this without a diagnosis; it could be a senior "moment"? I chatted quite sometime with a co-worker yesterday and she told me several instances where she just "forgot". Like, a recent work trip we took together and she bought lovely chocolates overseas. Like 3 big boxes of home made special order specially baked and packed for travel chocolates in her overhead bag. When she arrived home she simply forgot about her special order until weeks or months later. She had to discard them.
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