Odds are, I have no idea how you personally refer to your father. So, no offense. But various experiences over the years have convinced me that were a multimillion dollar large-scale national study conducted on the issue, that study would find a probabilistic* association between:
(A) Referring to one's father as "Daddy" into one's twenties, thirties, forties, or beyond.
(B) The tendency of some seemingly normal people to revert to surprisingly levels of immaturity when tensions or difficulties arise in their family.**
What I don't understand is exactly what the causal relationship is here. Is calling your father "daddy" itself causal? Does it have to do with the parenting style of those parents who encourage permanent Daddydom? Does it have to do with the kind of adult who perseverates indefinitely in calling her/his father Daddy? Something else? Ideas?
If only I were a freakonomist I could maybe figure out some clever way of disentangling the causal ambiguity for this issue, possibly involving sumo wrestlers.
* By "probabilistic", I mean that the relationship is nothing like "All A are B" or even necessarily "Most A are B" but just that "If A, then B is more likely than if not-A."
** I'm less convinced of the finding w/r/t those from the South, where the dynamics of the (non)desistence of "Daddy" seem different.