15-year old teenager from Finland, 35 years ago
He was 21.
As Torvalds wrote in his book Just for Fun, he eventually ended up writing an operating system kernel. On 25 August 1991, he (at age 21) announced this system in another posting to the comp.os.minix newsgroup
Are these enough?
https://en.wikipedia.org/wiki/Tulsa_race_massacre
https://en.wikipedia.org/wiki/Battle_of_Blair_Mountain
https://en.wikipedia.org/wiki/Columbine_Mine_massacre
https://en.wikipedia.org/wiki/1937_Memorial_Day_massacre
https://en.wikipedia.org/wiki/1985_MOVE_bombing
P.S. Fuck China and Fuck USA.