Cohort progression — PK Arena
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 50 freestyle50 breaststroke50 backstroke50 butterfly100 freestyle100 medley100 breaststroke25 backstroke25 breaststroke25 freestyle25 butterfly100 backstroke
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2016 born 2015 born 2014 born 2013