The Big Bang happened 16.8 billion years ago, and matter cannot be created or destroyed. Therefore, we are all technically 16.8 billion years old. So, to answer your question, officer, yes, she is of age.
Big Bang Age Loophole
Categories
Explanation
Experiment
The joke uses a scientific fact (the Big Bang and the conservation of matter) to create an absurd and humorous conclusion. It plays on the idea that if matter can't be destroyed and we are made of matter, then we are all as old as the universe, so the character is not underage. It is a funny way to avoid answering the question about a person's age by using a made up loophole.