The present invention relates to a composition for inhibiting cellular senescence, comprising N-[2-(cyclohexyloxyl)-4-nitrophenyl]-methanesulfonamide. During the progression of cellular senescence, the expression of COX-2 was decreased, whereas the enzymatic activity of COX-2 was increased, and the cellular senescence regulatory effects of the three selective COX-2 inhibitors had no connection with the concentration of intracellular reactive oxygen species, the activity of NF-.kappa.B and the amounts of p53 and p21 proteins. Rather, it was found that the three selective COX-2 inhibitors regulated the expression of caveolin-1 at the transcriptional level and regulated the intracellular total cholesterol concentration, and these results were closely connected with the cellular senescence regulatory effects of the three selective COX-2 inhibitors.