The Effects of Aging on Hair–More Than Just Amount 478 Wills et al. also found that the hair of pre-menopausal women (N = 80) was greasier than the hair of post-menopausal women (N = 47) by expert visual assessment. In addition, the amount of lipid found on the forehead of these same subjects was significantly higher in the pre-menopausal group than either post-menopausal groups receiving or not receiving hormone replacement therapy, and the post-menopausal group not on hormone replacement therapy had the lowest amount of lipid (-57% versus the pre-menopausal group). The ages of these three groups were: pre-menopausal, mean age 30, age range 24–34 post-menopausal, mean age 60, age range 50–76 and post-menopausal with hormone replacement therapy, mean age 57, range 48–68. So, the prime variables are menopause and hormone replacement therapy however, there is also an additional factor of age especially between pre- and post-menopausal groups. Consumer Perception of Changes in Fiber Properties with Age and Important Knowledge Gaps This section deals only with those fiber properties that have been shown to change with age and the consumer hair assembly properties that have been shown to be or likely to be affected by Figure 3