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Background: A declining trend of menarcheal age is noted in many developing and developed countries since last century. There is a reduction in the age of menarche by nearly one month per decade suggesting a secular decline in age of menarche among Indian women. Aim: To find out the mean age of menarche in the adolescent girls and their mothers and to know the factors associated with the change in the mean age of menarche. Methodology: A comparative cross-sectional study was conducted in SRM field practice area, Mamandur involving100 adolescent girls and their mothers using a semistructured questionnaire. Descriptive statistics and chi square analysis, univariate and multivariate analysis were used to analyse the data. A value of p < 0.05 is considered significant. Results: The mean age of menarche in adolescent girls is 12.5 (±1.42) years and their mother is 14 (±1.10) years. The study revealed that in menstrual history, age of menarche, regularity, menstrual flow and habitual and lifestyle factors like outside food consumption, sedentary/active lifestyle, sleep, dietary habits, polycystic ovary syndrome (PCOS) showed significant difference between adolescent girls and their mother. In univariate analysis outside food consumption, sedentary lifestyle and hours of activity were found significant. In multivariate analysis sedentary lifestyle was only found to be significant for early menarche. Conclusion: A decline in the mean age of menarche was found among adolescent girls compared to their mothers. The adolescent girls attained menarche early compared to their mothers and this difference was attributed to sedentary lifestyle.