Cosmetic use of dedifferentiated plant cells from a plant of the Rosa sp. genus, or an extract or a lyophilizate of the cells, as an active agent, for caring for aged skin or aged hair, is claimed. Independent claims are included for: (1) a cosmetic composition comprising either, as active agent, at least one of dedifferentiated plant cell, or at least one of dedifferentiated plant cell derived from a Lancome rosebush, or an extract or a lyophilizate of the cell, where the dedifferentiated plant cells are obtained by placing cells of a plant of the Rosa sp. genus in culture in a culture medium comprising at least ammonium nitrate, potassium nitrate, calcium chloride, magnesium sulfate, monopotassium phosphate, manganese(II) sulfate, zinc sulfate heptahydrate, potassium iodide, sodium molybdate, cupric sulfate, ferrous sulfate heptahydrate, myoinositol, nicotinic acid, pyridoxine hydrochloride, thiamine hydrochloride or sucrose, and optionally kinetin, EDTA disodium dihydrate and/or naphthaleneacetic acid； and (2) dedifferentiated plant cells derived from the Lancome rosebush. ACTIVITY : Dermatological； Endocrine-Gen. MECHANISM OF ACTION : None given.
