Cohort progression — Društvo vodnih športov POSEJDON
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 backstroke100 freestyle50 butterfly50 breaststroke100 breaststroke100 backstroke100 butterfly200 freestyle200 breaststroke400 freestyle100 medley200 backstroke200 medley200 butterfly800 freestyle25 breaststroke25 freestyle1500 freestyle25 backstroke
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2017