There are 40 new cases of carcinoma of breast per 100,000 women/ year in country 'X' & 100 new cases / 100,000 women/ year in Country 'Y'. Based on this statistical data which of the following statement is true?

Age is the most impoant risk factor for breast cancer Breast cancer is uncommon below age of 35, its incidence is increasing rapidly b/w ages of 35 to 50. A slight bimodal trend in the age distribution has been observed with a dip in incidence at the time of menopause. A secondary rise in frequency often occurs after the age of 65. Women who developed their first breast cancer under the age of 40, had three times the risk of developing a second breast cancer than those who developed their first cancer after the age of 40 Indeed the etiologies of pre-menopausal & post-menopausal breast cancer appears to be different. Other Risk factors of breast cancer: Family history of breast cancer Delayed first pregnancy Early menarche and late menopause Elevated estrogen & progesterone levels Prior breast biopsy Higher socio-economic status Radiation exposure etc.