Well to start, Age regression is completely non-sexual. It's not a kink, and it should not be sexualized or mistaken for age play/DDLG.

Age regression is a therapeutic method, that have been suggested by some therapists, where the age regressor regresses to a certain younger age.

So again, don't sexualize it.

Age ranges can range to anything younger than yourself! Most people usually regress to the age of a kid, for example five, though, there's also teen space! This is where you regress to the age of a teenager. There is a huge range of regression and there's no right or wrong way to do it. Remember that.