Barbara Bestor is an American architect based in Los Angeles, California.
 She is the principal of Bestor Architecture, founded in 1992.
 Examples of her work include the Beats Electronics Headquarters in Culver City, the Nasty Gal Headquarters in downtown Los Angeles, Intelligentsia Coffee & Tea in Los Angeles, and the Toro Canyon House in Santa Barbara.
 In 2015 she married director Tom Stern.
 In 2017 she was elected to the AIA's College of Fellows.
Sophia Christina Amoruso (born April 20, 1984) is an American businesswoman.
 At age 23, she started an online eBay store selling vintage clothing and other items, which she named "Nasty Gal Vintage".
Kani Ladies is a fashion label for young women.
 It was launched in 2001 as a sister of the popular hip hop brand Karl Kani.
 Kani Ladies started with a small urban collection next to the men’s collection and was sold in the same stores as Karl Kani.
 In the following years, Kani Ladies evolved into an independent street fashion label for young women.
Jamie Elizabeth Gunns (30 November 1985 in Lambeth, London, England) is a British fashion model.
 Early in her career, Gunns was an editorial model whose clients included the like of Roberto Cavalli and Chanel.
 Currently, Gunns has become popular on the internet due to her appearance in online retailers such as ASOS.com, Bon Prix, Nasty Gal, Nordstrom, Nelly, and Littlewoods.
5-7-9 is a low to mid-end fashion retailer, commonly found in malls throughout the continental United States and Puerto Rico, and formerly Hawaii.
 It is a sister company to Rainbow Shops.
 The chain offers mid to low-priced fashions for young teens and young women between 13 and 22 years of age.
 The store's name refers to the junior miss clothing sizes the store specializes in.
Bikini Luxe is an American online retailer that specializes in fashion clothing, swimwear, and accessories for young women.
 The company was founded in 2013 by Candice Galek and is based in Miami, Florida.
 The retailer stocks over 2,500 bikinis and one-piece swimsuits along with a collection of designer clothing items and accessories, such as activewear, jewelry, and dresses.
 The company made headlines in the Spring of 2016 after founder and CEO, Candice Galek, posted controversial photos on her LinkedIn profile.
Nasty Gal is an American retailer that specializes in fashion for young women.
 The company has more than 550,000 customers in over 60 countries.
 Founded by Sophia Amoruso in 2006, Nasty Gal was named “Fastest Growing Retailer” in 2012 by INC Magazine.
 Nasty Gal is based in Los Angeles.
 Amoruso originally began selling vintage clothes from her eBay account, and later switched to sell its own label of clothes, on her own website.
 In 2017, the company was purchased by the BooHoo Group out of chapter 11 of the U.S. bankruptcy code.
The Rogers Park Young Women's Action Team (YWAT) is a group of primarily African-American high school females in Chicago who take action on social issues.
 They started out as a group of high school females working to end street harassment.
 Their primary mission is ""to end violence against women and girls"" and they ""empower women to take action on issues that affect their lives (particularly issues of violence against girls and young women).""
 They primarily empower low-income women of color under 21 years of age.
Rena Rosenthal (1880–1966) was a trend-setting American retailer and businesswoman.
 Known principally for her exclusive Madison Avenue retail shop in New York City, she was an influential arbiter of taste and fashion in the interior decorating world, particularly during the introduction of modernism to North America.
Claire's is an American retailer of accessories and jewelry primarily aimed toward girls and young women, founded in 1961, and based in Hoffman Estates, Illinois, a suburb of Chicago.

Question: Nasty Gal is an American retailer that specializes in fashion for young women, founded in 2006, by which American businesswoman, that started it at age 23?
Answer: Sophia Christina Amoruso