There are some crickets I think who retired at their prime
- Kumar Sangakkara: He was in tremendous form in world cup 2015 scoring more than 500 runs in 7 matches with 4 consecutive centuries. I guess after his retirement srilankan cricket is yet not able to find his alter
2. Brendon McCullum: World Cup 2015 was surely one of the best for the kiwis and one of the reason was this destructive opener and captain who just changed the approach of the team and completely change how the world sees New-Zealand. He just retired after horrible loss in the finals but o guess he could have played for 2019 world cup. Not only this he is the guy who scored fastest test century in his last game.
3. Ab de Villiers: Well anybody who like cricket knows how the retirement of this player was put of the blue while he was not in the bad form. No one just couldn't believe him retiring and the reason is still not much clear of his retirement.
So, these are the cricketers I think retired at their peak.