The present invention relates to novel compounds of formula (I) where: X is an -OH or =O grouping； n is an integer between 0 and 5； R' is H or a C1-C4 alkyl radical, when n>；=2, two adjacent -OR' groupings can together form the divalent radical -O-CH2-O-； except when X=OH, the compound does not comprise a double ethylene link in the alpha position of the carbon having said OH. The invention also relates to the salts thereof, to the optical isomers thereof, to the cosmetic and pharmaceutical compositions containing same, and to the use thereof to prevent and cosmetically treat the signs of aging on the skin.
