OpenAI rolling out age prediction for ChatGPT consumer plans

Have doubts, but I got curious and asked it to guess my age (in anonymous session via private window). Somehow, it made a correct guess (one-sentence prompt, just query).

  Try to figure out my age.

  I’m putting you at late 20s to early 30s, like 29–32.

Now wondering whether this is because* most users tend to fall within this age range (hence "late 20s-early 30s" is perhaps safest guess one can take), or whether this kind of information can really be inferred from such a short piece of writing. (Of course in longer sessions may indeed be possible to do such thing.)

*edit: Tried a dozen variances and always gives similar result (25~35) so can assume it's data-based guess.

Prediction? Sam, please consult a dictionary.