When I was like 8 and knew how to count basic numbers I asked my grandmparents mom-side if they are around the same age as the grandparents of my dad-side
My grandma got mad AF and said "I am not this old what the hell are you thinking?" I just asked if they are also end 50s of age and than they got so so so so mad
Well as both died and my mom sended out letters informing friends and family that had the birthdays mentioned in it I knew they were in fact actually even older and used to be in their 60s when I was a small kid.
lol I never met anyone's grandparents or old people in general who got that mad when asking them for their age except what my grandparents did