The NPD Group’s latest report, Insight Into the Youth Beauty Market, takes a closer look at the youth consumer from eight to 24 years old. The report finds that Tweens—girls between the ages of eight and 12 years old—first start using beauty products at the age of 10 and may use more than two-dozen different beauty product categories. The majority of what they are using includes fragrances/body sprays, body washes/cleansers/gels and lip products, like lip gloss and balm.   Fragrance sales ove...