My wife and I have a 12 year old, 10 year old and a seven month old baby.
(Thanks Covid...lol)
My wife is 43, and she rang up to get some vaccinations for herself and me prior to the baby being born. The lovely nurse on the other end knew nothing apart from my wife's age and name, and that the vaccinations relate to being around babies.
'Oh you must be so very excited! You're quite young, so...is this your first grandchild?'
I'm 46, so even more ancient, but I found the whole thing completely hilarious. My wife was less amused. She doesn't look her age, and isn't used to being thought of as 'older'...!!!