My age regression is often congruent to my stress level. When I am more stressed, I am more prone to age regression. This also happens in high anxiety situations. I suppose it is just my way to cope and try to release the emotions I am feeling in those times.
For instance, today I was very busy and had to be out around people all day. When I got home, I fully regressed without trying, and I ended up crying in Daddy's arms until he was able to help me calm down and tell him what was wrong.
So really, it depends for me!