I bumped into someone I hadn't seen for couple of years yesterday. Normal catch up chit chat. I asked how her DS was (she only has one DC) and asked whether he was now in Y8 or Y9 at school. She has to think about it then asked"he turns 14 in January, does that make him Y8 or Y9?". I had to tell her Y9.
My DC left school years ago but I always knew which year they were in at any given point. I was really surprised she didn't seem to know. Is she unusual or aren't people really aware? She's a lovely, bright woman so no issues with memory etc.