As KazanFirst's own sources reported, the boy is 17 years old. He is a student at the Lobachevsky Lyceum. As witnesses of the tragedy told the publication, the boy was pulled out from under the train, and when he was asked the question "why did you do this?", the teenager said that he simply did not want to live.
Resource :
https://kazanfirst.ru/news/ya-ne-hochu-zhit-stala-izvestna-lichnost-rebenka-kotoryj-upal-pod-poezd-v-kazani