I’m 28, call mine Dad, always have, can’t remember calling him Daddy, can’t have since a very young age. Refer to him as ‘the old man/the old chap’ generally.
Called mother, mother since teens, she makes out she dislikes it but secretly does I think. It’s a bit sarcastic/p taking, but we do live in a very rural area and it’s common place amongst the odder/more old fashioned locals.
My nephew (4) calls his dad his full name when he’s annoyed with him, abd when in a cheeky mood, his nickname, Bunter/bunt. Usually Daddy though.
A distant cousin has called his dad Brian since a toddler, they’re like best mates so seems normal now, but was weird to me when I was a kid.