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Menarche is the first menstrual bleeding, marks the beginning of female puberty and the potential for future reproduction. Menarche happens between the ages of nine and sixteen, with 13 being the average age. The age at which menarche begins can be influenced by numerous elements includes genetics, diet, and body mass index. An early menarche is defined as menarching before the age of twelve and late menarche is defined as menarching before the age of fourteen. Many developed and developing nations have seen a decrease in menarcheal age over the past century. Consequently, this research was formulated to evaluate the influence of lifestyle and the age of menarche among girls in urban and rural area. The objectives of the study i) To assess the age of menarche of the subjects ii) To estimate the somatic status of the subjects, iii) To evaluate the dietary pattern of the subjects, iv) To assess the physical activity level of the subjects. The investigation was carried out in schools at rural and urban areas in Kannur district, Kerala, with the sample size of 120 individuals aged 10 to 13 years those who attained menarche. A questionnaire was constructed and validated which includes dietary pattern, menstruation and physical activity pattern. With the help of suitable statistical test, the result revealed that average age of menarche is 11.8 in rural area and 10.75 in urban area. The results indicate that majority of the urban subjects have higher education, occupation and income than rural area. Majority of them belongs to normal BMI age group. However, number of obese and overweight (41.6 percent) are greater in urban area. Majority of them follow a healthy dietary pattern including non-vegetarian diet (93.3 percent), number of meals per day with preferred food type is home - cooked foods (70 percent) in both rural and urban area. Nearly 60 percent of subjects skip meals in urban area while rural area result indicate only 23.3 percent. The obtained result shows that a healthy food consumption is followed by rural area while urban area shows consumption of junk food is higher when it compares with rural area. Among the study subjects, majority of their menstrual cycle is regular and severity of menstrual symptoms were found to be more in those who attained menarche early which is in urban area. The study however reflects the fact that average age of menarche is later in rural area than urban area due to various factors including higher income, high occupation and unhealthy food choices. Additionally, this analysis identifies menarcheal age declines in a secular manner than their mothers and a significant difference in the diet, physical activity and lifestyle pattern of the subjects from rural and urban areas.