I’m not sure that any of will ever truly understand that powerful yearning to engage in what we do, especially those of us with regressive tendencies.
For me it is not a question of ever or never growing up, cause hey, here I am in mature analytical mode discussing this, and in a heartbeat something could trigger that extraordinary part of me that experiences feelings which can only be described as purely infantile.
The best I can come up with for myself, is that a strong and determined part of my psyche has hung on, refusing to integrate into the rest of me that has grown and developed over the years.
There is a definite aspect of my personality which is undeniably a baby, and somehow this has managed to remain with me my entire life.
While it has its own place within my personality, it also has a degree of influence over the rest of my personality, all positive I should add.
The reason I have hung on to my baby self, may be as simple as not wanting to let go of the feelings and experiences of incredible wonder in discovering myself and the world I inhabit. There is no doubt that regression is an intensely sensual and emotional experience unlike anything my adult self experiences. And while this can be fleeting, ebbing and flowing between adult and baby space, there is always a genuine sense of authenticity about it; it feels real.
Unfortunately, I rarely have the opportunity to truly let go and allow myself to fully enter little space, but I take whatever I can whenever I can. What I do know and have experienced though, is that a door exists for me that is always accessible, which enables me to embrace this extraordinary part of myself, and dayumm is it a joy.
So, this is my perspective, I’m sure it differs for everyone, and I should add that it is a whole lot more complicated and nuanced in my life than I have mentioned in this post, I was just trying to address the OPs questions.