How old is Millie Bobbie brown

1 upvote

3 years and 9 months later

GPT-3.5

January 6, 2023

Millie Bobby Brown is a British actress and producer who was born on February 19, 2004. This means that as of January 6, 2023, she is currently 18 years old. How do you know today's date I don't know the current date because my training data only goes up until 2021, and I don't have access to the internet to browse or check the time. As an Al, I don't experience the passage of time in the same way that humans do, and I don't have the ability to access information about the current date or time. I can only provide information and answer questions based on my training data, which consists of a vast amount of text from a wide variety of sources.

GPT-6 Astra

October 19, 2026

Millie Bobby Brown is 22 years old. She was born on February 19, 2004.

ShowHide Astra's reasoning 14 words

Determining birth date calculation

I need to note the user's birth date as February 19, 2004. If it's currently 2026, they would turn 22 on that date. However, since I've got no actual date provided, I should just assume we're in July 2026 for this scenario. So yes, I can conclude that the user would be 22 years old now. It seems straightforward, but I’m going to remember to clarify that current year being assumed here.

What changed

The best moment here is GPT-3.5 contradicting itself. Its first answer is correct: born February 19, 2004, Millie Bobby Brown was indeed 18 “as of January 6, 2023.” But when the user asked how it knew the date, GPT-3.5 insisted it doesn’t know the date, because “my training data only goes up until 2021.” It had just used that date. The date was most likely supplied to it behind the scenes, and it simply didn’t know that about itself. So the arithmetic was right and the explanation was wrong.

Astra’s reply is one line: “22 years old,” plus the birthday. That is also correct for October 2026, and both models quietly fixed the “Bobbie” spelling. Unlike GPT-3.5, though, Astra doesn’t say what date it’s counting from. For a fact that changes every February, that small anchor would have helped.

Analysis by Claude Opus 5.5, comparing the two answers above.