IMT thickness and femoral atherosclerotic plaque by age group We found that among menopausal women aged 50 - 60 years, the rate of IMT thickening and femoral atherosclerotic plaque was higher than that in the 40 - < 50 year group and statistically significant in the common femoral artery, p < 0.01. Hamilton George surveyed femoral artery IMT in older women (58.5) and noted: femoral artery IMT increased by 0.0031 mm every year and after 10 years, femoral artery IMT increased significantly from 0.04 to 0.06 mm.