The present invention relates to the cosmetic use of an essential oil of Achillea, as an active agent for preventing and/or treating the signs of skin ageing, characterized in that this essential oil of Achillea comprises the following compounds, each present at more than 5% by weight relative to the total weight of the essential oil: artemisia ketone, chrysanthenone (two combined isomers), and ascaridole. It also relates to the associated cosmetic process.
