Cohort progression — UTW "Masters" Zgierz
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 butterfly50 breaststroke50 backstroke100 breaststroke100 freestyle100 medley100 butterfly100 backstroke200 medley200 backstroke200 breaststroke200 freestyle200 butterfly400 freestyle400 medley800 freestyle
50 m freestyle men · 25 m pool
X: swimmer age in season · Y: median season-best time
born 1987 born 1957