More information gathered on the internet:
His civil name is Giel, his refuge name is Lobsang Nyima.
Giel wants to study in the Monastery of Jonang (India) for the next 15 years, 3 years to master the Tibetan language and 12 years to study Buddhism.
His mother initiated him into the Buddhist religion.
2 months ago, his uncle, worried that Giel may not have taken this decision with full reflection, requested an investigation from the justice court in Gent (Belgium) and Giel was not able to catch his flight.
The legal authorities of Gent did investigate the case, for the welfare of the young monk candidate, and eventually granted permission for the teenager to go ahead.
Giel left Belgium a few days ago.
He says that he may miss his lifestyle sometimes but he is not worried as he says he is not keenly interested in the life of a teenager anyway.
The news made it to the local newspapers, but also to the FIGARO, an important French newspaper.
http://www.lefigaro.fr/actualite-france/2013/09/12/01016-20130912ARTFIG00509--15-ans-il-veut-devenir-moine-bouddhiste-au-nepal.php