Dermatologists explain that increased hair loss after age 30 is common, driven by a combination of factors including stress, genetics, and hormonal changes. High cortisol levels from stress can negatively impact nutrient absorption and scalp health. Declining estrogen and progesterone levels also contribute to hair thinning. Lifestyle choices further influence hair health, with stress creating an environment that hinders hair growth and increases shedding by affecting blood supply to follicles and sleep cycles.