Unfortunately, based on current scientific knowledge and available records, pinpointing the exact oldest known hair is impossible. Hair is composed of keratin, which degrades over time, especially in unfavorable conditions. Therefore, hair rarely survives over very long geological timescales.
While the provided reference concerns Jeanne Louise Calment, the oldest verified human, it does not address the question of the oldest known hair in general. Human hair from mummies can be thousands of years old, and fossilized hair-like structures have been found dating back much further, but determining if these structures are definitively "hair" and accurately dating them presents significant challenges.
Therefore, without more specific information on criteria (e.g., location, preservation type), I can't give a definitive answer.
