One day, while exploring the attic, BoJack stumbled upon the old clock again. It was there, covered in dust, its hands still. He touched it, and once more, the room filled with light.
In psychological terms, "age regression" refers to when a person reverts to a younger state of mind. However, in the context of the meme, the definition is much more lighthearted and situational. Bojay Age Regression