Markus „Kjaerbye” Kjærbye is the youngest player that has ever won a major. During the final match of ELEAGUE Major 2017, he had only 18 years and 277 days. The current FaZe player overtook JW, the winner of Dreamhack Winter 2013, by only 3 days.
JW shows up in the classification two times. 2 years after the win in Jönköping, his team - fnatic, won during ESL One Katowice 2015. The final match was played 20 days after his 20th birthday, which gave him also 4th spot in the ranking of the youngest CS:GO Major winners.
Virtus.pro win during EMS One Katowice 2014 connects the youngest and the oldest Major winners. In the top3 of the youngest players, we can find byali, who had 19 years and 320 days during the final, and as top5 and top3 of the oldest major winners we have Neo and Taz, respectively 26 years and 275 days and 27 tears and 283 days.
The rest of the top5 is filled by Gambit Esports players - Adren, Dosia, and Zeus. During PGL Major Krakow 2017 they had 27 years and 169 days, 29 years and 34 days, and 29 years and 289 days in sequence.