Premature hair loss is a sign of metabolic problems, insulin resistance, scalp inflammation and several other factors. Androgen receptor sensitivity plays a part but we know from twin studies that people with identical genetics can exhibit hair loss that progresses at different rates so it's undeniable that there is a strong epigenetic component as well.

Poor metabolic health, insulin resistance, elevated SHBG, inflammation in the scalp due to fungal infections like Malassezia, and various other factors.