Age regression is when somebody reverts to a child-like state of mind, often as a coping mechanism for things like PTSD, depression, anxiety, and other mental health issues. Basically age regressors are more at-peace and worry-free whilst in "little space" (A term for when one is in said mindset). These people simply need breaks from the stress of being old and often have a childish personality even outside of regression (Though sometimes it's not as obvious).
Contrary to popular belief, age regression is NOT a kink or even related to sexual intercourse whatsoever. Some age regressors refer to themselves as littles and to their significant other as "Daddy", "Mommy", or just as their "Caregiver" Since they'd typically take care of their "Little" as if they're an actual child.
Hey, so why does she sleep with so many stuffed animals? Oh, she's just an age regressor. How cute!
Bro, what's with the pacifier? You a baby now or something?
Kinda, I'm regressing right now.
Sorry, I didn't know! That's cool!
Why does your blog have so much pastel And childish stuff?
Oh, it's an age regression blog. Nice!