Please watch Michael Matias (son of Google Israel Director Yossi Matias) as he explains the value of building a startup when you are still at High School. Michael, in his gap year, is organizing events around the world inspiring students to develop innovative apps and products.
https://www.youtube.com/watch?v=t402XK1kzu0
http://www.timesofisrael.com/google-scion-whiz-kid-hacks-his-way-to-idf-service/