This age regression file can only be triggered by the listener, but every time someone else uses a childish word around you it makes you need to use the trigger a little more.  Words like baby, little, childish, brat, tantrum make you slowly feel smaller and smaller inside until you have to trigger yourself at which point you regress back to the age the words make you feel, possibly even a baby and stay that way until you're ready to be an adult again.