Cohort progression — MKS "Ros" Pisz
Median season-best times of each birth-year cohort, overlaid by age — shows how consecutive groups developed at the same stage of training.
Event: 100 freestyle50 freestyle200 freestyle100 breaststroke50 butterfly200 medley100 medley50 breaststroke50 backstroke400 freestyle100 butterfly100 backstroke200 breaststroke200 butterfly400 medley200 backstroke800 freestyle
100 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2007 born 1998