1) New zealand
2) Sri Lanka
3) Pakistan
4) Bangladesh
Explanation:
Pakistani fast bowler Mohammad Hasnain became the youngest ever cricketer to take a hat-trick in T20I (Twenty 20 Internationals) cricket in the 2nd T20 match against Sri Lanka at the Gaddafi Stadium, Lahore, Pakistan during the Sri Lankan cricket team tour in Pakistan. He is 19 years and 183 days old. It was his second T20I match.