Stress is often discussed as a potential factor in turning hair white or grey, particularly in younger individuals. While some participants in the discussion report experiencing white or grey hair in their 20s, they suggest that genetics may play a significant role, as many have family histories of early greying. The process of hair turning grey is linked to the cessation of pigment production by hair follicles, which can be influenced by aging, genetic predisposition, and possibly dietary deficiencies, such as a lack of copper. Some individuals also share experiences of hair changing color, with reports of white or grey hair reverting to darker shades, which raises questions about the mechanisms behind hair pigmentation. The conversation touches on the idea that significant stress or trauma may accelerate the greying process, but it is generally agreed that genetic factors are a primary cause for early onset grey hair. Additionally, there are anecdotal references to variations in hair color among different individuals, including in facial hair, suggesting that this phenomenon is not limited to scalp hair.