This research investigates the potential of Castanopsis argentea plant extracts as natural protectors against skin aging by inhibiting elastase, the enzyme that degrades elastin and affects skin elasticity. In vitro analysis demonstrated partial elastase inhibition, with effectiveness increasing with concentration, though it did not exceed 50% inhibition. The extract, prepared through solvent dilution and ultrasonic homogenization, showed promising anti-inflammatory, antioxidant, and polyphenolic properties, suggesting its potential as a natural alternative for anti-aging skincare applications.