26/02/2015 15:21 GMT | Updated 27/02/2015 07:59 GMT

15-Year-Old Noa Mintz Is Getting Rich From Babysitting

Ben Gabbe via Getty Images
NEW YORK, NY - DECEMBER 09: (L-R) Caleb Mintz, Avieal Mintz, Meredith Berkman, Yael Mintz and Noa Mintz attend American Friends of Magen David Adom's Annual New York Benefit Dinner at The Lighthouse at Chelsea Piers on December 9, 2013 in New York City. (Photo by Ben Gabbe/Getty Images)

Noa Mintz is a savvy schoolgirl who is already worth an estimated $375,000 (£243,000) after starting her own babysitting service.

Nannies By Noa is a website bringing babysitting into the 21st century, serving one of New York's richest areas, created by Noa at just 12 years old.

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The site matches clients with one of its 50 babysitters and 25 full-time nannies, charging $50-100 per match.

Noa charges a base rate of 15% of each full-timer's gross annual salary, which can be anywhere from $50,000 to $80,000.

Demand has been so intense she has been forced to hire a CEO, 26-year-old Allison Johnson. It was "a little bit of a challenge" to take orders from a teenager, she admits, but Allison values women who make things happen for themselves.

"I hosted art classes in third-grade and I used to take lemonade stands to the next level, so I always had the entrepreneurial spirit," Noa said.

"It's not that I wanted to be a babysitter. I just recognized what the potential of a New York nanny should be, so I gave it a shot and it got big very fast."