Cohort progression — SP 28 Lublin
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 backstroke50 breaststroke50 butterfly100 medley25 freestyle100 freestyle100 backstroke25 butterfly25 breaststroke25 backstroke
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 2013 born 2012 born 2011