Compounds of general formula (I) : R1-Wm-Xn-AA1-AA2-AA3-AA4-AA5-AA6-Yp-Zq-R2 (I) their stereoisomers, mixtures thereof and/or their cosmetically or pharmaceutically acceptable salts, cosmetic and/or pharmaceutical compositions which contain them and their use in medicine, and in processes of treatment and/or care of the skin, hair and/or mucous membranes, in particular in the aging and photoaging of the skin.